feat: GitLab OIDC

[i4ki]

What this PR does / why we need it:

Add support for authenticating CI jobs on behalf of GitLab trust relationship set up for a project or repository.

Which issue(s) this PR fixes:

none

Special notes for your reviewer:

Does this PR introduce a user-facing change?

yes

[github-actions[bot]]

metric: time/op
CloudReadLines-4: old 995µs ± 4%: new 1003µs ± 3%: delta: 0.00%
CloudReadLine-4: old 7.19ms ± 1%: new 7.21ms ± 1%: delta: 0.37%
ListFiles-4: old 51.9µs ± 1%: new 51.9µs ± 1%: delta: 0.00%
Generate-4: old 2.51s ± 2%: new 2.51s ± 1%: delta: 0.00%
GenerateRegex-4: old 1.71s ± 1%: new 1.72s ± 0%: delta: 0.30%
TokensForExpressionComplex-4: old 1.26ms ± 0%: new 1.26ms ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 889ns ± 1%: new 890ns ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 21.7µs ± 0%: new 21.7µs ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 1.45ms ± 0%: new 1.45ms ± 0%: delta: 0.00%
TokensForExpression-4: old 1.26ms ± 0%: new 1.26ms ± 0%: delta: 0.00%
PartialEvalComplex-4: old 434µs ± 0%: new 432µs ± 0%: delta: -0.30%
PartialEvalSmallString-4: old 3.61µs ± 0%: new 3.61µs ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 1.87ms ± 0%: new 1.87ms ± 0%: delta: -0.24%
PartialEvalHugeInterpolatedString-4: old 4.90ms ± 1%: new 4.90ms ± 1%: delta: 0.00%
PartialEvalObject-4: old 21.6µs ± 1%: new 21.7µs ± 1%: delta: 0.00%
TmAllTrueLiteralList-4: old 6.26ms ± 0%: new 6.27ms ± 0%: delta: 0.11%
TmAllTrueFuncall-4: old 160µs ± 0%: new 160µs ± 0%: delta: 0.09%
TmAnyTrueLiteralList-4: old 147ms ± 0%: new 147ms ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 161µs ± 0%: new 161µs ± 0%: delta: 0.00%
TmTernary-4: old 2.82µs ± 0%: new 2.79µs ± 0%: delta: -0.98%
TmTry-4: old 52.0µs ± 1%: new 51.9µs ± 0%: delta: -0.19%
metric: alloc/op
CloudReadLines-4: old 3.12MB ± 0%: new 3.12MB ± 0%: delta: 0.00%
CloudReadLine-4: old 3.37MB ± 0%: new 3.37MB ± 0%: delta: -0.00%
ListFiles-4: old 22.0kB ± 0%: new 22.0kB ± 0%: delta: 0.00%
Generate-4: old 2.32GB ± 0%: new 2.32GB ± 0%: delta: 0.00%
GenerateRegex-4: old 955MB ± 0%: new 956MB ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 412kB ± 0%: new 412kB ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 592B ± 0%: new 592B ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 12.4kB ± 0%: new 12.4kB ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 402kB ± 0%: new 402kB ± 0%: delta: 0.00%
TokensForExpression-4: old 412kB ± 0%: new 412kB ± 0%: delta: 0.00%
PartialEvalComplex-4: old 356kB ± 0%: new 356kB ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 1.74kB ± 0%: new 1.74kB ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 166kB ± 0%: new 166kB ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 4.38MB ± 0%: new 4.38MB ± 0%: delta: 0.00%
PartialEvalObject-4: old 20.4kB ± 0%: new 20.4kB ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 1.74MB ± 0%: new 1.74MB ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 45.5kB ± 0%: new 45.5kB ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 37.9MB ± 0%: new 37.9MB ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 45.6kB ± 0%: new 45.6kB ± 0%: delta: 0.00%
TmTernary-4: old 1.20kB ± 0%: new 1.20kB ± 0%: delta: 0.00%
TmTry-4: old 11.2kB ± 0%: new 11.2kB ± 0%: delta: 0.00%
metric: allocs/op
CloudReadLines-4: old 5.54k ± 0%: new 5.54k ± 0%: delta: 0.00%
CloudReadLine-4: old 60.0k ± 0%: new 60.0k ± 0%: delta: 0.00%
ListFiles-4: old 321 ± 0%: new 321 ± 0%: delta: 0.00%
Generate-4: old 25.9M ± 0%: new 25.9M ± 0%: delta: 0.00%
GenerateRegex-4: old 18.6M ± 0%: new 18.6M ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 4.93k ± 0%: new 4.93k ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 21.0 ± 0%: new 21.0 ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 228 ± 0%: new 228 ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 3.29k ± 0%: new 3.29k ± 0%: delta: 0.00%
TokensForExpression-4: old 4.93k ± 0%: new 4.93k ± 0%: delta: 0.00%
PartialEvalComplex-4: old 2.86k ± 0%: new 2.86k ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 23.0 ± 0%: new 23.0 ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 35.0 ± 0%: new 35.0 ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 23.1k ± 0%: new 23.1k ± 0%: delta: 0.00%
PartialEvalObject-4: old 125 ± 0%: new 125 ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 13.6k ± 0%: new 13.6k ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 460 ± 0%: new 460 ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 252k ± 0%: new 252k ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 462 ± 0%: new 462 ± 0%: delta: 0.00%
TmTernary-4: old 28.0 ± 0%: new 28.0 ± 0%: delta: 0.00%
TmTry-4: old 147 ± 0%: new 147 ± 0%: delta: 0.00%