feat: add preview.commit_sha/pushed_at

[wmalik]

What this PR does / why we need it:

This PR adds two new fields to the preview object:

• commit_sha (the latest commit sha of the branch)
• pushed_at (the time the latest commit was pushed to the branch)

These fields are sent to TMC when a preview is created, and are used to determine if the preview is out of date.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

No.

[github-actions[bot]]

metric: time/op
CloudReadLines-4: old 1.01ms ± 2%: new 1.00ms ± 4%: delta: 0.00%
CloudReadLine-4: old 7.14ms ± 2%: new 6.97ms ± 2%: delta: -2.43%
ListFiles-4: old 53.0µs ± 1%: new 52.9µs ± 0%: delta: 0.00%
Generate-4: old 2.53s ± 2%: new 2.55s ± 1%: delta: 0.46%
GenerateRegex-4: old 1.73s ± 1%: new 1.72s ± 2%: delta: -0.59%
TokensForExpressionComplex-4: old 1.26ms ± 0%: new 1.26ms ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 890ns ± 0%: new 890ns ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 22.4µs ± 1%: new 22.4µs ± 1%: 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 430µs ± 0%: new 431µs ± 1%: delta: 0.31%
PartialEvalSmallString-4: old 3.66µs ± 0%: new 3.65µs ± 1%: delta: -0.42%
PartialEvalHugeString-4: old 1.85ms ± 0%: new 1.85ms ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 4.89ms ± 1%: new 4.90ms ± 1%: delta: 0.00%
PartialEvalObject-4: old 21.5µs ± 1%: new 21.5µs ± 1%: delta: -0.32%
TmAllTrueLiteralList-4: old 6.27ms ± 1%: new 6.27ms ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 160µs ± 0%: new 161µs ± 0%: delta: 0.00%
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 2.83µs ± 0%: new 2.86µs ± 1%: delta: 0.78%
TmTry-4: old 51.9µs ± 0%: new 51.9µs ± 0%: delta: 0.00%
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 956MB ± 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 353kB ± 0%: new 353kB ± 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 2.83k ± 0%: new 2.83k ± 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 146 ± 0%: new 146 ± 0%: delta: 0.00%

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