🔧 Toggle on isolatedDeclarations flag on the project

[dubzzz]

Description

Fixes #5057

Checklist — Don't delete this checklist and make sure you do the following before opening the PR

• The name of my PR follows gitmoji specification
• My PR references one of several related issues (if any)
  • New features or breaking changes must come with an associated Issue or Discussion
  • My PR does not add any new dependency without an associated Issue or Discussion
• My PR includes bumps details, please run yarn bump and flag the impacts properly
• My PR adds relevant tests and they would have failed without my PR (when applicable)

Advanced

• Category: Configuration update on build side
• Impacts: Safer build

[dubzzz]

Probably have to wait for microsoft/TypeScript#58771 and/or microsoft/TypeScript#58829, as discussed in https://x.com/ndubien/status/1813361689238335668?t=o2hcjF9X67AcJuSXIJ-VYA&s=19

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.32%. Comparing base (7fa7852) to head (37f4da0).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5136   +/-   ##
=======================================
  Coverage   95.32%   95.32%           
=======================================
  Files         234      234           
  Lines       10414    10414           
  Branches     2773     2774    +1     
=======================================
  Hits         9927     9927           
  Misses        487      487           

Flag	Coverage Δ
unit-tests	95.32% <ø> (ø)
unit-tests-18.x-Linux	95.32% <ø> (ø)
unit-tests-20.x-Linux	95.32% <ø> (ø)
unit-tests-22.x-Linux	95.32% <ø> (ø)
unit-tests-latest-Linux	95.32% <ø> (ø)

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[dubzzz]

Waiting for microsoft/rushstack#4877

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