Clean up extension config

[isaacroldan]

WHY are these changes introduced?

When loading the extension configuration we were injecting some extra properties that are not expected by the contracts.
The extension config should reflect exactly what's in the toml, and nothing else.

WHAT is this pull request doing?

Remove extensions and path from the extension config.

How to test your changes?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[github-actions]

We detected some changes at either packages/*/src or packages/cli-kit/assets/cli-ruby/** and there are no updates in the .changeset.
If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.74% (-0% 🔻)	8484/11664
🟡	Branches	69.43% (+0.02% 🔼)	4154/5983
🟡	Functions	71.55%	2201/3076
🟡	Lines	73.07% (-0% 🔻)	8028/10987

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / update-extension.ts	64.86% (-3.71% 🔻)	54.55%	60%	68.75% (-4.58% 🔻)

Test suite run success

1928 tests passing in 872 suites.

Report generated by 🧪jest coverage report action from a2c1925