Improves error messages when fetch fails due to TLS errors. #10375

Job	Run time
fixup / block-fixup	7s
labels / InternalPRRequired	1s
lint / bazel	5m 23s
test (linux, ubuntu-20.04) / bazel	7m 29s
test (linux, ubuntu-20.04, -asan) / bazel	6m 44s
test (linux, ubuntu-20.04, -debug) / bazel	6m 29s
test (macOS, macos-15) / bazel	6m 43s
test (windows, windows-2022) / bazel	16m 19s
	49m 15s

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