fix: Migrate away from GoogleCredentials.fromStream() usages (#11765) #5447

Job	Run time
gitignore_correctness	47s
generate-readme	50s
package_name_check	44s
gapic-bom	1m 27s
owlbot-py	52s
owlbot-yaml	44s
group_id_check_for_maps_libraries	7m 4s
root-pom	1m 22s
	13m 50s

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