Revert "[Infra] Attempt to reduce Crashlytics testing flake"

[ncooke3]

Reverts #15183

Unfortunately didn't make a difference.

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	1 Warning
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)

Generated by 🚫 Danger

[andrewheard]

Potentially we could do something like this for the Crashlytics test too:

firebase-ios-sdk/scripts/build.sh

Lines 524 to 525 in d4d341d

	-retry-tests-on-failure \
	-test-iterations 3 \