related to: https://github.com/coder/internal/issues/1387
Sometimes our tests using DERP flake like the above, but we have no information at the DERP layer about why. This enables verbose DERP logging in CI.
Logs are kinda spammy, but most tests do not force DERP and so only use it for discovery (disco).
A test like TestWorkspaceAgentListeningPorts/OK_BlockDirect drops around 50 DERP packets e.g.
```
t.go:111: 2026-03-13 15:20:52.201 [debu] agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x00\x00\x00\x00\x00\x00\x00\x00}\xae;l\xd9Hk8\xa8l\x1cK\xedO{狦)\x18NIw\xc4k\xd2-\x19\xbf\xfb\xdd\x17\xa9b\xac\xfd#\xf7\xcaC\xbe\vq(u=\xa7\x16\xe9\x9aLjS\x1fXL\x19y\xf4\x1dE%\xb3\xff\x9d:8\xa9\x95X\xfe\xf8\x95\x7f\x9dv$\f\xf4\xbe"
t.go:111: 2026-03-13 15:20:52.201 [debu] agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x01\x00\x00\x00\x00\x00\x00\x00\x05x\xb6RD;\xb4\x80\xb6\x0f\xf6KŠc\xfb1\xbd\x06\xb70K3\x97`\x8d\xd2\x14\xed\xc5\xd6\xc6\xcaV\xbf\x878\xb2Ƥ\xf0\xd5\xf7\xc0\x1b\x9f\x04Y\x03\x17\xd4\x06\xee\xb2G\r){\x9f\xde\xe0(\xb5N\xfejR_\xf6q\xa4\xfaT\x9a\xd8\xcbk\xba\x16K"
t.go:111: 2026-03-13 15:20:52.201 [debu] agent.net.tailnet.net.wgengine: magicsock: got derp-999 packet: "\x04\x00\x00\x00C}\xe0\xb9\x02\x00\x00\x00\x00\x00\x00\x00\x1e\x93a\x15\xfev\x81'\xa9?\xe8nR\xce<\x91\x86\xcau@\xb9\xcfɩ\xef\xd1眓\x95\xf3*X^7\x99\x88\xb0|\x8cS\xe4@[\x16\xda\xca\xd4\xd9\x1dP\xd0\xfe\xd9r\x8c\xfcp~dP\xfaK\xe0\xf9y\xb2\x11\x15\xfe\xdcx鷽\xdeF\xf7\x92\xe8"
```
Follow-up to #22705 (pre-commit/pre-push hooks).
Unifies `test` and `test-race` into the same structure and lets CI call
`make test-race` instead of reproducing the gotestsum command.
**Parallelism**: Extracted from `GOTEST_FLAGS` into
`TEST_PARALLEL_PACKAGES`
/ `TEST_PARALLEL_TESTS` (default 8x8). `test-race` overrides to 4x4 via
target-specific Make variables. `TEST_NUM_PARALLEL_PACKAGES` and
`TEST_NUM_PARALLEL_TESTS` env vars continue to work for both targets.
**GOTEST_FLAGS**: Changed from simply-expanded (`:=`) to
recursively-expanded
(`=`) so target-specific overrides take effect at recipe time.
**CI**: `.github/actions/test-go-pg/action.yaml` now calls `make
test-race`
/ `make test` instead of hand-rolling the gotestsum command, eliminating
drift between local and CI configurations.
Refs #22705
Spike Curtis