fix(ui) Move template editable changes to their own files

[chriscollins3456]

Moves the changes to determine if a template should be editable and the settings button to their own files to separate concerns.

[alwaysmeticulous]

🔴 Meticulous spotted visual differences in 1409 of 1554 screens tested: view and approve differences detected.

Meticulous evaluated ~9 hours of user flows against your PR.

_{Last updated for commit 268da82. This comment will update as new commits are pushed.}

[codecov]

Bundle Report

Changes will increase total bundle size by 73 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
datahub-react-web-esm	28.58MB	73 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: datahub-react-web-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/index-*.js	73 bytes	18.92MB	0.0%

Files in assets/index-*.js:

• ./src/app/homeV3/settings/HomePageSettingsButtonWrapper.tsx → Total Size: 59 bytes

• ./src/app/homeV3/context/hooks/useIsTemplateEditable.ts → Total Size: 64 bytes

• ./src/app/homeV3/context/PageTemplateContext.tsx → Total Size: 2.66kB

• ./src/app/homeV3/HomePageContent.tsx → Total Size: 530 bytes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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