DRIVERS-3162 Add test for SRV hostname validation

[aclark4life]

• Fix test name to reflect three parts

DRIVERS-3162

Changes in this PR

• Add test for SRV hostnames with three or more parts

Test Plan

• New spec test

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

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✅ All modified and coverable lines are covered by tests.

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Pull request overview

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[NoahStapp]

@aclark4life is this ready for review? I see a lot of test failures. This PR should also link to PYTHON-5327 and not the top-level DRIVERS ticket.

[aclark4life]

@aclark4life is this ready for review? I see a lot of test failures. This PR should also link to PYTHON-5327 and not the top-level DRIVERS ticket.

Waiting on https://jira.mongodb.org/browse/DEVPROD-34211

[NoahStapp]

@aclark4life is this ready for review? I see a lot of test failures. This PR should also link to PYTHON-5327 and not the top-level DRIVERS ticket.

Waiting on https://jira.mongodb.org/browse/DEVPROD-34211

Can you mark it as draft then and update the ticket to be blocked on that DEVPROD ticket?

[aclark4life]

Superseded by #2863