Updated `KeyVaultCredentialPolicy` to extend `BearerTokenAuthenticationPolicy` in Key Vault clients.#24199

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vcolin7 merged 20 commits intoAzure:mainfrom vcolin7:key-vault-auth-fix

Sep 30, 2021

+2,373-1,515

Commits on Sep 18, 2021

Replaced all uses of KeyVaultCredentialPolicy with BearerTokenAuthenticationPolicy in Key Vault clients. Removed the KeyVaultCredentialPolicy and ScopeTokeCache classes from all Track 2 Key Vault l…
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Commits on Sep 20, 2021

We now pass the appropriate scope to BearerTokenAuthenticationPolicy creating a new instance in client builders, tests and samples.
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Added tests and recordings for KEK tests on MHSM. Fixed and cleaned up tests.
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Removed unused imports.
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Commits on Sep 21, 2021

Renamed MHSM_SCOPE to MANAGED_HSM_SCOPE in all client builders.
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Commits on Sep 26, 2021

Commits on Sep 27, 2021

Made an attempt at fixing the backup async live tests.
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Commits on Sep 28, 2021

Added sleep timer when running against service for restore operations.
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Commits on Sep 30, 2021

Applied PR feedback.
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