Drop front-end framework detection code

[twschiller]

What does this PR do?

• Drops framework detection code used by Page Editor
  • Moves single element selector inference method back into utils folder. See #6581: lazy load page script to reduce memory footprint #6772
• Drops the custom Component Reader options in the Page Editor
• Keeps functionality required for existing mods to work (see Component Reader and Set Vue Values)
• Dropping the code makes the page script a little smaller

Discussion

• For manual test plan, @mthek10 can help validate on the test sites for customers still on the Component Reader and Set Vue Value bricks

Screenshot

Checklist

• Add tests
• New files added to src/tsconfig.strictNullChecks.json (if possible)
• Designate a primary reviewer: @grahamlangford

[fregante]

LGTM

[github-actions]

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (aefc3e5) 70.03% compared to head (f313397) 70.13%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6776      +/-   ##
==========================================
+ Coverage   70.03%   70.13%   +0.10%     
==========================================
  Files        1193     1190       -3     
  Lines       36967    36897      -70     
  Branches     6939     6923      -16     
==========================================
- Hits        25888    25877      -11     
+ Misses      11079    11020      -59     

Files	Coverage Δ
...c/bricks/transformers/component/ComponentReader.ts	64.70% <ø> (ø)
src/contentScript/messenger/api.ts	100.00% <ø> (ø)
src/contentScript/messenger/registration.ts	0.00% <ø> (ø)
src/contentScript/pageEditor/elementPicker.ts	67.35% <100.00%> (+0.27%)	⬆️
src/contrib/editors.ts	0.00% <ø> (ø)
src/pageEditor/fields/SelectorSelectorWidget.tsx	64.36% <ø> (-0.41%)	⬇️
...ditor/fields/selectorListItem/SelectorListItem.tsx	100.00% <100.00%> (ø)
src/pageEditor/panes/insert/useAutoInsert.ts	0.00% <ø> (ø)
src/pageEditor/starterBricks/formStateTypes.ts	94.44% <ø> (ø)
src/pageEditor/tabState/tabStateSlice.ts	63.46% <ø> (+4.13%)	⬆️
... and 7 more

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