…will be rotated (#2112)

* build: have Kokoro grab service account credentials from secret that will be rotated

Source-Link: https://togithub.com/googleapis/synthtool/commit/4a0230eb8dc497f36fd3839e6144982131f30a9d
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:f59941869d508c6825deeffce180579545fd528f359f549a80a18ec0458d7094

* feat: implement parallel operations (#2067)

* feat: implement parallel operations

* add more parallel operations

* add header to test file

* update import of fs/promises

* fix pathing on windows, fix mocking of fs promises

* add jsdoc headers to class and uploadMulti

* add jsdoc comments to remaining functions

* update comment wording

* add experimental jsdoc tags

* feat: add directory generator to performance test framework

* clarify variable names and comments

* capitalization

* wip: transfer manager performance tests

* feat: merged in application performance tests (#2100)

* fix: fixed many bugs (#2102)

* fix: cleaning up bugs

* fix: fixed many bugs

* fix: more work on transfer manager perf metrics (#2103)

* fix: more work on transfer manager perf metrics

* fix unit tests for tm

* fix: performance test refactoring, comments (#2104)

* refactor: refactor constants (#2105)

* refactor: refactor constants

* bug fixes

* bug fixes

* bug fixes

* linter fixes, download to disk for performance test

* rename transfer manager functions

* remove callbacks from transfer manager

* add more experimental tags, update comments

* change signature of downloadManyFiles to accept array of strings or a folder name

* linter fix

* add transfer manager samples and samples tests

Co-authored-by: Sameena Shaffeeullah <[email protected]>

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: add crc32c validation option to chunked download, cleanup naming (#2110)

* feat: add crc32c validation option to chunked download, cleanup naming in perf tests

* close file in finally block

Co-authored-by: Sameena Shaffeeullah <[email protected]>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>