Add retry logic for streaming timeout errors in Urllib3Fetcher #3825

Job	Run time
test-with-sslib-main / Test securesystemslib main branch (not a merge blocker)	15s
test / Lint Test	22s
test / Tests (3.x, macos-latest)	1s
test / Tests (3.12, ubuntu-latest)	20s
test / Tests (3.13, ubuntu-latest)	15s
test / Tests (3.11, ubuntu-latest)	15s
test / Tests (3.x, windows-latest)	18s
test / Tests (3.9, ubuntu-latest)	19s
test / Tests (3.10, ubuntu-latest)	17s
test / coveralls-fin	9s
test / All tests passed	0s
	2m 31s

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