[provider/googlesecretmanager] `schemeName` has the word `provider` in it

[braydonk]

Component(s)

confmap/provider/googlesecretmanagerprovider

Describe the issue you're reporting

No other providers have provider in the schemeName, but the scheme for this provider is googlesecretmanagerprovider. I think it should be googlesecretmanager only.

(Yes I should have noticed this during review)

[github-actions]

Pinging code owners:

• confmap/provider/googlesecretmanagerprovider: @aabmass @dashpole @jsuereth @psx95 @braydonk @ridwanmsharif

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[braydonk]

@XuechunHou manual ping for codeowner who isn't in the org yet.