feat: upgrade GA api clients to new surface

[bshaffer]

In preparation for the GA of the new client surface, upgrade all remaining samples to use the new surface. This will allow us to run tests and catch any issues before its release. We MUST NOT MERGE the sample updates until the new surface is GA

Sample directories to upgrade:

• asset - chore: upgrade asset samples to new surface #1895
• bigtable - chore: upgrade bigtable samples to new surface #1897
• compute - chore: upgrade compute samples to new surface #1896
• dlp - chore: upgrade dlp samples to new surface #1898
• dialogflow - chore: upgrade dialogflow samples to new client surface #1951
• firestore - n/a
• functions - n/a
• kms - chore: upgrade kms samples to new client surface #1950
• media/livestream - chore: upgrade medialivestream samples to new surface #1870
• monitoring - chore: upgrade monitoring samples to new client surface #1949
• pubsub - n/a
• recaptcha - chore: upgrade recaptcha samples to new client surface #1948
• secretmanager - chore: upgrade secretmanager samples to new client surface #1946
• securitycenter - chore: upgrade securitycenter samples to new client surface #1947
• spanner - chore: upgrade spanner samples to new client surface #1952
• speech - chore: upgrade speech samples to new surface #1887
• storagetransfer - chore: upgrade storagetransfer samples to new surface #1882
• tasks - chore: upgrade tasks samples to new surface #1881
• texttospeech - chore: upgrade TextToSpeech samples to new surface #1903
• translate - chore: upgrade translate samples to new surface #1883
• video - chore: upgrade video samples to new surface #1884
• vision - chore: upgrade vision samples to new surface #1885