⚡️ [RUMF-1171] prefer const enums

[BenoitZugmeyer]

Motivation

Minified size in bytes:

Package	Before	After	Delta
datadog-logs.js	33188	32690	-1.5%
datadog-rum-slim.js	63867	60910	-4.6%
datadog-rum.js	113044	109360	-3.3%

Changes

• Enforce and change enum to const enums
• Fix the disallowEnumExports rule because I noticed that some enums were still exported, and convert the IncrementalSource enum to a plain object

Testing

• Local
• Staging
• Unit
• End to end

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1364 (39044db) into main (1cc42c1) will decrease coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1364      +/-   ##
==========================================
- Coverage   91.11%   90.95%   -0.17%     
==========================================
  Files         104      103       -1     
  Lines        4267     4189      -78     
  Branches      948      934      -14     
==========================================
- Hits         3888     3810      -78     
  Misses        379      379              

Impacted Files	Coverage Δ
...rc/domain/internalMonitoring/internalMonitoring.ts	98.41% <ø> (-0.08%)	⬇️
packages/core/src/tools/error.ts	90.00% <ø> (-0.91%)	⬇️
packages/core/src/tools/utils.ts	86.69% <ø> (-0.81%)	⬇️
packages/logs/src/domain/logsSessionManager.ts	100.00% <ø> (ø)
packages/rum-core/src/domain/assembly.ts	100.00% <ø> (ø)
packages/rum-core/src/domain/lifeCycle.ts	100.00% <ø> (ø)
packages/rum-core/src/domain/rumSessionManager.ts	88.23% <ø> (-2.01%)	⬇️
packages/rum/src/domain/record/types.ts	100.00% <100.00%> (ø)
... and 7 more

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