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
https://github.com/coder/internal/issues/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. This should have some impact to reduce test flakiness.
Solves #15575
Adds OAuth access token revocation when unlinking external auth
provider. Due to revocation not being consistently implemented by
providers this is only best effort attempt. Unsuccessful revocation
won't influence link removal.
Before db_metrics were all or nothing. Now `InTx` metrics are always recorded, and query metrics are opt in.
Adds instrumentation & logging around serialization failures in the database.
* chore: drop github per user rate limit tracking
Rate limits for authenticated requests are per user.
This would be an excessive number of prometheus labels,
so we only track the unauthorized limit.
Zach