Add git-blame-ignore-revs file

[blink1073]

References

Follow up to #12279

Code changes

Ignore the auto-formatting commit for git blame.

User-facing changes

Easier to browse git history.

Backwards-incompatible changes

None

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Benchmark report

The execution time (in milliseconds) are grouped by test file, test type and browser.
For each case, the following values are computed: min <- [1st quartile - median - 3rd quartile] -> max.

The mean relative comparison is computed with 95% confidence.

Results table

Test file	large_code_notebook	large_md_notebook
open
chromium
actual	3667 <- [3808 - 3838 - 3866] -> 4006	2463 <- [2526 - 2556 - 2593] -> 2786
expected	3695 <- [3801 - 3823 - 3861] -> 4023	2439 <- [2513 - 2533 - 2574] -> 2757
Mean relative change	0.0% ± 0.5%	0.8% ± 0.7%
switch-from
chromium
actual	635 <- [661 - 681 - 851] -> 932	476 <- [784 - 914 - 935] -> 1066
expected	615 <- [661 - 680 - 841] -> 928	468 <- [892 - 917 - 938] -> 1117
Mean relative change	0.8% ± 3.7%	-2.8% ± 6.0%
switch-to
chromium
actual	307 <- [363 - 370 - 381] -> 404	249 <- [272 - 280 - 286] -> 297
expected	309 <- [363 - 373 - 383] -> 408	246 <- [271 - 278 - 287] -> 304
Mean relative change	-0.6% ± 1.6%	-0.0% ± 1.1%
close
chromium
actual	648 <- [912 - 925 - 941] -> 1037	438 <- [468 - 473 - 480] -> 511
expected	649 <- [901 - 915 - 931] -> 1061	439 <- [462 - 473 - 481] -> 508
Mean relative change	1.1% ± 1.4%	0.0% ± 0.8%

Changes are computed with expected as reference.