[WIP] Disallow merging of enum declarations

[rbuckton]

This is an experiment to access the impact of disallowing the merging of enum declarations.

[typescript-bot]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

[rbuckton]

@typescript-bot test top400
@typescript-bot user test this

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
test top400	✅ Started	✅ Results
user test this	✅ Started	✅ Results

[typescript-bot]

@rbuckton Here are the results of running the user tests with tsc comparing main and refs/pull/61262/merge:

Everything looks good!

[typescript-bot]

@rbuckton Here are the results of running the top 400 repos with tsc comparing main and refs/pull/61262/merge:

Everything looks good!

[rbuckton]

@typescript-bot test top10.00

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
test top10.00	✅ Started

[rbuckton]

@typescript-bot test top1000

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
test top1000	✅ Started	✅ Results

[typescript-bot]

@rbuckton Here are the results of running the top 400 repos with tsc comparing main and refs/pull/61262/merge:

Everything looks good!