Speed up e2e(core) suite with Ginkgo procs and concurrent waits

[ChrisJBurns]

Summary

• The core E2E suite was taking >11 minutes because ~30 specs ran serially on an 8-core runner that had capacity to spare. This PR runs them across 4 Ginkgo processes, spreading the specs and reducing wall-clock time to an estimated ~3–4 minutes.
• Four test files named servers using only GinkgoRandomSeed(), which is identical across all Ginkgo procs — concurrent processes would collide on the same Docker container name. Those are switched to GenerateUniqueServerName which embeds the OS PID.
• ExpectMCPServersRunning previously polled workloads one at a time; specs that start 4 containers paid the full sum of readiness waits. Goroutines + WaitGroup make the wait concurrent (bounded by the slowest, not the sum), benefiting both single- and multi-process runs.

Type of change

• Performance improvement (non-breaking change which improves speed)

Test plan

• The CI run linked in the issue shows >11 min; the new procs: 4 matrix field will be exercised on the next CI run
• go build ./test/e2e/... and go vet ./test/e2e/... pass locally with the changes
• PROCS defaults to 1 for all other test matrix entries, so no other suite behaviour changes

Special notes for reviewers

--procs=N in Ginkgo v2 spawns N independent OS processes, each with its own BeforeSuite/AfterSuite. Core specs use the real Docker daemon with no per-process config isolation, so unique container names are the only required safety property — which GenerateUniqueServerName (PID + nanosecond timestamp + random seed) guarantees.

The procs matrix field is absent from all other suites, so they receive PROCS=1 (sequential) and are unaffected.

Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.20%. Comparing base (be0e0c3) to head (bdfe150).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6070      +/-   ##
==========================================
+ Coverage   72.18%   72.20%   +0.01%     
==========================================
  Files         721      721              
  Lines       75062    75062              
==========================================
+ Hits        54183    54196      +13     
+ Misses      17017    17005      -12     
+ Partials     3862     3861       -1     

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