Catch agnostic HTTP error types in prefect and swap the pagination raise

[mwdd146980]

What does this PR do?

Widens PrefectClient.http_exceptions to admit the backend-agnostic HTTP error types alongside the existing requests ones, and swaps the InvalidURL raise in check_pagination_url to the agnostic HTTPInvalidURLError. Mirrors the widened tuple into the mock_prefect_client test fixture.

Motivation

Part of the requests to httpx migration (W1b workstream). Production funnels every HTTP call through the single self.http_exceptions tuple, so widening it repairs all eight catch sites at once. The check_pagination_url raise is the one production behavior change in this PR: it must be swapped together with the tuple widening, since the raised value is caught by that same tuple, decoupling them would produce an unhandled exception rather than a clean test failure.

No observable behavior change under the default requests backend: the logged message text is identical either way and the exception never surfaces past the internal catch.

Verification

Red-then-green on test_paginate_events_rejects_external_next_page: swapping only the test assertion first produced a clean AssertionError (the requests InvalidURL is not an HTTPInvalidURLError), confirming the right red before the paired production edit landed. ddev test prefect passes all 5 unit tests, ddev test -fs prefect is clean, and no requests reference remains in tests/test_unit.py.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-datadog-us1-prod]

   

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⚠️ Warnings

🚦 3 Pipeline jobs failed

PR | test / test-minimum-base-package (linux, ubuntu-22.04, prefect, Prefect (py3.13-3.6.17), py3.13-3.6.17) / minimum-base-package-Prefect (py3.13-3.6.17)-py3.13-3.6.17     

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PR | test / check     

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 88.21% (+0.07%)

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Validation Report

Validation	Description	Status
dep	Verify dependency pins are consistent and Agent-compatible	❌

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