flaky-tests.yml: small fixups (#11857)

#### What this PR does

1. Increase fetch-depth, so the github author detection works
2. Fix secret paths. The repo name is already appended to by the
`grafana/shared-workflows/actions/get-vault-secrets`
3. Exclude some tests which are "expected" to fail and block PRs

---------

Signed-off-by: Dimitar Dimitrov <[email protected]>

Author: dimitarvdimitrov

.github/workflows/flaky-tests.yml

@@ -22,15 +22,17 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: '0' # we need all commits so that the git history check returns valid commits
 
       - name: Retrieve Secrets from Vault
         id: get-secrets
         uses: grafana/shared-workflows/actions/get-vault-secrets@5d7e361bc7e0a183cde8afe9899fb7b596d2659b # get-vault-secrets-v1.2.0
         with:
           repo_secrets: |
-            LOKI_URL=ci/repo/grafana/mimir/flaky-tests-bot:loki-url
-            LOKI_USERNAME=ci/repo/grafana/mimir/flaky-tests-bot:loki-username
-            LOKI_PASSWORD=ci/repo/grafana/mimir/flaky-tests-bot:loki-password
+            LOKI_URL=flaky-tests-bot:loki-url
+            LOKI_USERNAME=flaky-tests-bot:loki-username
+            LOKI_PASSWORD=flaky-tests-bot:loki-password
             APP_ID=mimir-github-bot:app_id
             PRIVATE_KEY=mimir-github-bot:private_key
 
@@ -43,7 +45,7 @@ jobs:
           owner: ${{ github.repository_owner }}
 
       - name: Run Flaky Tests Analysis
-        uses: dimitarvdimitrov/shared-workflows/actions/go-flaky-tests@7098037f3a45b90ae7938f3405aec85635d7181e # dimitar/analyze-test-failures/github-issues
+        uses: dimitarvdimitrov/shared-workflows/actions/go-flaky-tests@20a72aa1821825fb2871515ed53002e4c18842db # dimitar/analyze-test-failures/exclude-tests
         with:
           loki-url: ${{ env.LOKI_URL }}
           loki-username: ${{ env.LOKI_USERNAME }}
@@ -52,5 +54,6 @@ jobs:
           time-range: "7d"
           top-k: "3"
           skip-posting-issues: ${{ github.event_name == 'workflow_dispatch' && inputs.skip-posting-issues || 'false' }}
+          ignored-tests: "TestOurUpstreamTestCasesAreInSyncWithUpstream" # This is supposed to block upstream mimir-prometheus updates, so it's also expected to fail.
         env:
           GITHUB_TOKEN: ${{ steps.github-token.outputs.token }}