Enable update in apigee reference

[george-peng]

Add update capability to allow the reference to be updated without needing to recreate the entire resource.

Update API : https://cloud.google.com/apigee/docs/reference/apis/apigee/rest/v1/organizations.environments.references/update

Release Note Template for Downstream PRs (will be copied)

apigee: enable update in `google_apigee_env_references`

[github-actions]

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@NickElliot, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 3 files changed, 277 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 3 files changed, 277 insertions(+), 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 44
Passed tests: 14
Skipped tests: 29
Affected tests: 1

Click here to see the affected service packages

• apigee

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccApigeeEnvReferences_apigeeEnvironmentReferenceTest_Update

Get to know how VCR tests work

[modular-magician]

$\textcolor{red}{\textsf{Tests failed during RECORDING mode:}}$
TestAccApigeeEnvReferences_apigeeEnvironmentReferenceTest_Update[Error message] [Debug log]

$\textcolor{red}{\textsf{Errors occurred during RECORDING mode. Please fix them to complete your PR.}}$

View the build log or the debug log for each test