fix(all): Update hand-written clients to not use WithEndpoint override

[andyrzhao]

-logging clients delegate to the gapic generated client with the correct defaults, so no need to override.
-bigtable and spanner clients needs to be manually updated to use DefaultEndpoint and DefaultMTLSEndpoint

[hengfengli]

For Spanner, it looks good to me. 👍

[tritone]

Looks fine to me for bigtable. @kolea2 can you take a look as well?

[codyoss]

LGTM, but I'll wait to approve until other sub-module owners have a chance to see the changes. Note these changes already happened for all other currently generating gapic clients. This is a cleanup task to update the manual layers.

[0xSage]

Logging LGTM

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