acceptance: unset all SDK-known AI-agent env vars before tests

[janniklasrose]

Changes

• Sync knownAgents with SDK's useragent.listKnownAgents
• Add AGENT and AI_AGENT to env variable to drop during acceptance test

Why

Local test failures when run from agents.

The SDK derives its user-agent from agent-detection env vars and, since v0.132.0, treats even empty values as present, so clearing them via test.toml does not help. The previous list covered only a subset, leaving acceptance output dependent on which agent launched the test runner. Expand it to mirror useragent.listKnownAgents and split the generic AGENT/AI_AGENT fallback vars into their own list.

Tests

Local & CI

Previously, tests were failing with e.g.

--- FAIL: TestAccept (26.14s)
    --- FAIL: TestAccept/bundle/user_agent/simple
        --- FAIL: TestAccept/bundle/user_agent/simple/DATABRICKS_BUNDLE_ENGINE=direct (1.74s)
            acceptance_test.go:926: Diff:
                --- bundle/user_agent/simple/out.requests.validate.direct.json
                +++ .../out.requests.validate.direct.json
                @@ -1,7 +1,7 @@
                 {
                   "headers": {
                     "User-Agent": [
                -      "cli/[DEV_VERSION] databricks-sdk-go/[SDK_VERSION] go/[GO_VERSION] os/[OS] cmd/bundle_validate cmd-exec-id/[UUID] interactive/none auth/pat"
                +      "cli/[DEV_VERSION] databricks-sdk-go/[SDK_VERSION] go/[GO_VERSION] os/[OS] cmd/bundle_validate cmd-exec-id/[UUID] interactive/none auth/pat agent/claude-code_2-1-162_agent"
                     ]
                   },
                   "method": "GET",

---

Co-authored-by: Isaac

[eng-dev-ecosystem-bot]

Commit: 33e3d92

Run: 26891754895

[github-actions]

Waiting for approval

Based on git history, these people are best suited to review:

• @denik -- recent work in acceptance/

Eligible reviewers: @andrewnester, @anton-107, @pietern, @renaudhartert-db, @shreyas-goenka, @simonfaltum

_{Suggestions based on git history. See OWNERS for ownership rules.}

[janniklasrose]

We can consider exporting this from SDK. We can also skip updating knownAgents and limit to the ones we actually use day to day, since AGENT and AI_AGENT are the key change here

[janniklasrose]

covered by #5436