Remove New Repo Setup Flag and Hide Setup Repo Link

[nicholas-codecov]

Description

Since the new repo flag has been rolled out to 100% it's probably time that we can get rid of it in the codebase. This PR includes the removal of that flag, as well as removing the Setup Repo link for users who do not belong to the organization.

Notable Changes

• Add user belongs to org check in ReposTable
• Add a few optional chaining checks
• Remove flag related tests
• Refactor of ReposTables tests to mock endpoints instead of hooks

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[codecov]

Codecov Report

Merging #1650 (8526dce) into main (8397b61) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 8526dce differs from pull request most recent head 797a2bf. Consider uploading reports for the commit 797a2bf to get more accurate results

@@           Coverage Diff           @@
##             main    #1650   +/-   ##
=======================================
  Coverage   99.32%   99.32%           
=======================================
  Files         488      488           
  Lines        5606     5631   +25     
  Branches     1419     1427    +8     
=======================================
+ Hits         5568     5593   +25     
  Misses         38       38           

Impacted Files	Coverage Δ
src/shared/ListRepo/ReposTable/ReposTable.jsx	100.00% <100.00%> (ø)
src/services/pull/usePull.js	100.00% <0.00%> (ø)
src/services/user/useOnboardUser.js	100.00% <0.00%> (ø)
src/services/navigation/useNavLinks.js	100.00% <0.00%> (ø)
src/pages/PullRequestPage/Flags/Flags.jsx	100.00% <0.00%> (ø)
src/pages/PullRequestPage/Commits/Commits.jsx	100.00% <0.00%> (ø)
src/pages/PullRequestPage/PullRequestPage.jsx	100.00% <0.00%> (ø)
src/layouts/UserOnboarding/UserOnboardingForm.jsx	100.00% <0.00%> (ø)
src/layouts/UserOnboarding/UserOnboardingModal.jsx	100.00% <0.00%> (ø)
...rc/layouts/UserOnboarding/OrganizationSelector.jsx	100.00% <0.00%> (ø)
... and 10 more

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[terry-codecov]

Looks good! Full disclosure I did not comb through the test changes.