fix: remove initial global HTTP client usage #20128
Merged
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This PR makes the initial steps at removing usage of the global Go HTTP client, which was seen to have impacts on test flakiness in coder/internal#1020. The first commit removes uses from tests, with the exception of one test that is tightly coupled to the default client. The second commit makes easy/low-risk removals from application code (I'm new to the project). This should have some impact to reduce flakiness.