test(e2e): cover the register/daemon CLI and failing jobs (#1346)

The e2e suite started the runner in-process and never exercised failing jobs. This adds a scenario that builds the binary and drives `register` then `daemon` against the Gitea fixture, and one for failed, skipped, continue-on-error and timed-out jobs.

Verified locally against gitea/gitea:main-nightly.

Assisted-by: Codet:codet
Reviewed-on: https://gitea.com/gitea/runner/pulls/1346
Reviewed-by: Zettat123 <39446+zettat123@noreply.gitea.com>

e2e/testdata/workflows/cli.yml

@@ -0,0 +1,7 @@
+name: cli
+on: push
+jobs:
+  hello:
+    runs-on: e2e-cli
+    steps:
+      - run: echo e2e-cli-job-ran

e2e/testdata/workflows/failure.yml

@@ -0,0 +1,30 @@
+name: failure
+on: push
+jobs:
+  fail:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo e2e-before-fail
+      - run: exit 3
+      - if: success()
+        run: echo e2e-skipped-step
+      - if: failure()
+        run: echo e2e-failure-cleanup
+  tolerated:
+    runs-on: ubuntu-latest
+    steps:
+      - continue-on-error: true
+        run: exit 1
+      - run: echo e2e-tolerated-next
+  dependent:
+    needs: fail
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo dependent
+  timeout:
+    runs-on: ubuntu-latest
+    timeout-minutes: 1
+    steps:
+      - run: |
+          echo e2e-timeout-started
+          sleep 300