fix: gcp sa flow key cleanup

[danistrebel]

Description

What's changed, or what was fixed?

• clean up the existing service account keys earlier in the pipeline so that service account keys don't pile up if the pipeline breaks repeatedly

Issues Fixed

• Fixes Nightly build failure #721

Housekeeping

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• I have run all the tests locally and they all pass.
• I have followed the relevant style guide for my changes.

Full Repo Validation Required

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• PR requires full pipeline run (Run for changes only by default).

CC: @apigee-devrel-reviewers

[danistrebel]

/gcbrun

[OmidTahouri]

LGTM

[github-actions]

Mega-Linter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	4		0	0.14s
⚠️ BASH	bash-exec	102		1	12.9s
✅ BASH	shellcheck	102		0	16.75s
⚠️ BASH	shfmt	102		90	13.35s
⚠️ COPYPASTE	jscpd	yes		53	5.9s
✅ CREDENTIALS	secretlint	yes		no	4.08s
✅ DOCKERFILE	dockerfilelint	8		0	3.05s
✅ DOCKERFILE	hadolint	8		0	2.03s
✅ GIT	git_diff	yes		no	0.11s
✅ JAVA	checkstyle	6		0	11.15s
✅ JAVASCRIPT	eslint	91		0	1.89s
✅ JSON	eslint-plugin-jsonc	62		0	6.73s
✅ JSON	jsonlint	62		0	28.77s
⚠️ JSON	prettier	62		1	5.51s
✅ JSON	v8r	62		0	282.07s
⚠️ MARKDOWN	markdownlint	49		134	1.08s
✅ MARKDOWN	markdown-link-check	49		0	110.95s
⚠️ MARKDOWN	markdown-table-formatter	49		1	0.43s
✅ OPENAPI	spectral	11		0	31.67s
✅ PYTHON	bandit	7		0	1.38s
⚠️ PYTHON	black	7		1	1.95s
✅ PYTHON	flake8	7		0	1.24s
⚠️ PYTHON	isort	7		7	0.49s
⚠️ PYTHON	mypy	7		1	0.47s
✅ PYTHON	pylint	7		0	7.91s
⚠️ SPELL	cspell	795		1316	38.15s
⚠️ SPELL	misspell	795		1	0.43s
✅ XML	xmllint	402		0	0.18s
⚠️ YAML	prettier	33		1	2.87s
✅ YAML	v8r	33		0	99.41s
✅ YAML	yamllint	33		0	1.03s

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[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
references/gcp-sa-auth-shared-flow	pass	212s
TOTAL PIPELINE	pass	212s

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Commit version: 1d000aa