Add support for login_button filter

[nuotsu]

Describe the bug
login_button filter isn't recognized and the linter displays an error squiggly line.

Expected
Not show the linter error line.

Actual
The following Liquid code is accurate but shows the squiggly line:

{{ shop | login_button: action: 'follow' }}

Stack trace

Undefined filter login_buttontheme-check (UnknownFilter)

Debugging information

• MacOS Sonoma [14.0 (23A344)]
• Version: 1.11.0

Additional context

[charlespwd]

Same as #750

Try the following in your vscode settings.json

{
  "shopifyLiquid.themeCheckNextDevPreview": true
}