Add test utility to patch microbatch end time

[MichelleArk]

Housekeeping

• I am a maintainer of dbt-core

Short description

As part of introducing microbatch models, it will be necessary for concrete adapters to test their implementations against a base test defined in dbt-test-adapters. This base test will need to patch the current time, and while using freezegun is an option, it may be too imprecise and brittle for certain concrete adapters if their connectors rely on the current time for other pieces of functionality (e.g. cert validity).

Acceptance criteria

Introduce a test utility to narrowly patch current time for computing the bounds of a microbatch model.

Suggested Tests

N/A

Impact to Other Teams

None

Will backports be required?

No

Context

No response

[MichelleArk]

resolved by: #10712