fix proposal script not checking out new branch

[rochdev]

What does this PR do?

Fix proposal script not checking out new branch.

Motivation

Sending the result of git checkout to /dev/null meant that the or condition would never run, thus never creating the proposal branch which led future steps to fail.

[github-actions]

Overall package size

Self size: 9.28 MB
Deduped: 101.46 MB
No deduping: 101.98 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.5.1 | 29.73 MB | 29.73 MB | | @datadog/native-appsec | 8.5.2 | 19.33 MB | 19.34 MB | | @datadog/native-iast-taint-tracking | 3.3.1 | 13.99 MB | 13.99 MB | | @datadog/pprof | 5.7.1 | 9.51 MB | 9.88 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.4.0 | 2.77 MB | 5.42 MB | | @datadog/wasm-js-rewriter | 3.1.0 | 2.37 MB | 2.52 MB | | @datadog/native-metrics | 3.1.1 | 1.02 MB | 1.43 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.13.1 | 117.64 kB | 839.26 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | dc-polyfill | 0.1.6 | 24.56 kB | 24.56 kB | | shell-quote | 1.8.2 | 23.54 kB | 23.54 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.23%. Comparing base (593371e) to head (7ba28b2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5566      +/-   ##
==========================================
- Coverage   79.29%   79.23%   -0.07%     
==========================================
  Files         513      512       -1     
  Lines       23291    23223      -68     
==========================================
- Hits        18468    18400      -68     
  Misses       4823     4823              

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: release-proposal-test
Commit report: a1dc7a3
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 924 Passed, 0 Skipped, 10m 3.35s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-10 18:01:25

Comparing candidate commit 7ba28b2 in PR branch release-proposal-test with baseline commit 593371e in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 948 metrics, 15 unstable metrics.