Firestore: Add missing fields to Firestore database

[IchordeDionysos]

Adds a few missing fields from the Firestore database.
https://cloud.google.com/firestore/docs/reference/rest/v1/projects.databases

Release Note Template for Downstream PRs (will be copied)

firestore: added `update_time` and `uid` fields to `google_firestore_database` resource

[modular-magician]

Hello! I am a robot. It looks like you are a: Community Contributor Googler Core Contributor. Tests will require approval to run.

@trodge, 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.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[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.

Terraform GA: Diff ( 2 files changed, 34 insertions(+), 4 deletions(-))
Terraform Beta: Diff ( 2 files changed, 34 insertions(+), 4 deletions(-))

[modular-magician]

Tests analytics

Total tests: 3026
Passed tests 2725
Skipped tests: 297
Affected tests: 4

Action taken

Found 4 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccGKEHub2Scope_gkehubScopeBasicExample|TestAccGKEHub2ScopeIamMemberGenerated|TestAccGKEHub2ScopeIamBindingGenerated|TestAccGKEHub2ScopeIamPolicyGenerated

Get to know how VCR tests work

[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccGKEHub2Scope_gkehubScopeBasicExample[Debug log]
TestAccGKEHub2ScopeIamMemberGenerated[Debug log]
TestAccGKEHub2ScopeIamBindingGenerated[Debug log]
TestAccGKEHub2ScopeIamPolicyGenerated[Debug log]

Rerun these tests in REPLAYING mode to catch issues

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

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$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test