Add toggle to enable smart routing

[rablador]

A toggle to disable smart routing should be placed below the DAITA toggle. The toggle should be named Direct only. It should also have a footer explaining how, by default, enabling DAITA overrides multihop and an info icon that leads to an explanation for how smart routing works. When Direct only is toggled, the relay selector must honor user location constraints, allowing the user to end up in the blocked state. When turning on Direct only, if the user will end up in the blocked state, the user should be shown a pop-up explaining so - as it should already be working when toggling DAITA.

When DAITA is turned off, the Direct only toggle state shouldn't be affected.

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This change is 

[linear]

IOS-831 Add toggle to disable smart routing

[rablador]

Note: Waiting for a text in the "Direct only" info dialog.

Reviewable status: 0 of 21 files reviewed, all discussions resolved

[rablador]

Done.

Reviewable status: 0 of 23 files reviewed, all discussions resolved

[buggmagnet]

Reviewed 13 of 21 files at r1, 8 of 10 files at r2.
Reviewable status: 19 of 23 files reviewed, 4 unresolved discussions (waiting on @rablador)

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ios/MullvadVPN/View controllers/Settings/SettingsInfoButtonItem.swift line 22 at r2 (raw file):

                tableName: "DAITA",
                value: """
                DAITA (Defense against AI-guided Traffic Analysis) hides patterns in your encrypted VPN traffic. \

We should use the british english spelling of "Defence"

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ios/MullvadVPN/View controllers/Settings/SettingsInfoButtonItem.swift line 29 at r2 (raw file):

                with any server.
                Attention: Be cautious if you have a limited data plan as this feature will increase your network \
                traffic. This feature can only be used with WireGuard.

That last line is irrelevant on iOS, we only support WireGuard, we should remove it.

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ios/MullvadVPN/View controllers/Settings/SettingsInteractor.swift line 55 at r2 (raw file):

            selectedRelays?.entry == nil ? .multihop : nil
        } else {
            selectedRelays?.exit == nil ? .singlehop : nil

I'm not sure how I feel about this false dichotomy where the exit can be nil, since selectRelay cannot return a nil exit.

What do you think about this ?

        guard let selectedRelays = try? tunnelManager.selectRelays(tunnelSettings: tunnelSettings) else {
            return multihopEnabled ? .multihop : .singlehop
        }

        /// `selectRelays` *cannot* return a `nil` exit, therefore, either the entry is `nil`, or there is no error.
        return selectedRelays.entry == nil ? .multihop : nil

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ios/MullvadVPN/View controllers/VPNSettings/VPNSettingsInfoButtonItem.swift line 105 at r2 (raw file):

                tableName: "DAITA",
                value: """
                DAITA (Defense against AI-guided Traffic Analysis) hides patterns in your encrypted VPN traffic. \

Please revert this

[rablador]

Reviewable status: 19 of 23 files reviewed, 4 unresolved discussions (waiting on @buggmagnet)

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ios/MullvadVPN/View controllers/Settings/SettingsInfoButtonItem.swift line 22 at r2 (raw file):

Previously, buggmagnet wrote…

We should use the british english spelling of "Defence"

Done.

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ios/MullvadVPN/View controllers/Settings/SettingsInfoButtonItem.swift line 29 at r2 (raw file):

Previously, buggmagnet wrote…

That last line is irrelevant on iOS, we only support WireGuard, we should remove it.

Done.

[rablador]

Reviewable status: 19 of 23 files reviewed, 4 unresolved discussions (waiting on @buggmagnet)

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ios/MullvadVPN/View controllers/Settings/SettingsInteractor.swift line 55 at r2 (raw file):

Previously, buggmagnet wrote…

I'm not sure how I feel about this false dichotomy where the exit can be nil, since selectRelay cannot return a nil exit.

What do you think about this ?

        guard let selectedRelays = try? tunnelManager.selectRelays(tunnelSettings: tunnelSettings) else {
            return multihopEnabled ? .multihop : .singlehop
        }

        /// `selectRelays` *cannot* return a `nil` exit, therefore, either the entry is `nil`, or there is no error.
        return selectedRelays.entry == nil ? .multihop : nil

You're right, but we don't even need look at entry. Either selectedRelays is nil or it's correct.

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ios/MullvadVPN/View controllers/VPNSettings/VPNSettingsInfoButtonItem.swift line 105 at r2 (raw file):

Previously, buggmagnet wrote…

Please revert this

Done.

[buggmagnet]

Reviewed 1 of 10 files at r2, 1 of 1 files at r3, 2 of 3 files at r4, all commit messages.
Reviewable status: 21 of 23 files reviewed, 1 unresolved discussion

[buggmagnet]

Reviewed 1 of 1 files at r5.
Reviewable status: 22 of 23 files reviewed, all discussions resolved

[github-actions]

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