Remove self-hosted runner workflows

Signed-off-by: Delan Azabani <dazabani@igalia.com>

.github/workflows/self-hosted-runner-select.yml

@@ -1,48 +0,0 @@
-name: Select Self-hosted Runner
-on:
-  workflow_call:
-    inputs:
-      github-hosted-runner-label:
-        required: true
-        type: string
-      self-hosted-image-name:
-        required: true
-        type: string
-      self-hosted-runner-scope:
-        required: false
-        type: string
-        default: /orgs/${{ github.repository_owner }}/actions/runners
-      force-github-hosted-runner:
-        required: false
-        type: boolean
-        default: false
-    outputs:
-      unique-id:
-        value: ${{ jobs.runner-select.outputs.unique-id }}
-      selected-runner-label:
-        value: ${{ jobs.runner-select.outputs.selected-runner-label }}
-      is-self-hosted:
-        value: ${{ jobs.runner-select.outputs.is-self-hosted }}
-
-jobs:
-  # Selects a self-hosted runner if available, or else a GitHub-hosted runner.
-  # We generate a unique id for the workload, then ask our monitor API to
-  # reserve a self-hosted runner for us.
-  runner-select:
-    name: Select Runner
-    runs-on: ubuntu-latest
-    outputs:
-      unique-id: ${{ steps.select.outputs.unique_id }}
-      selected-runner-label: ${{ steps.select.outputs.selected_runner_label }}
-      is-self-hosted: ${{ steps.select.outputs.is_self_hosted }}
-    steps:
-      - uses: delan/servo-ci@main
-      - name: Select and reserve best available runner
-        id: select
-        run: |
-          ci runner select \
-            --github-repository '${{ github.repository }}' \
-            --github-run-id '${{ github.run_id }}' \
-            --monitor-api-token '${{ secrets.SERVO_CI_MONITOR_API_TOKEN }}' \
-            --github-hosted-runner-label '${{ inputs.github-hosted-runner-label }}' \
-            --self-hosted-image-name '${{ inputs.self-hosted-image-name }}'

.github/workflows/self-hosted-runner-timeout.yml

@@ -1,28 +0,0 @@
-name: Detect Self-hosted Runner Timeout
-on:
-  workflow_call:
-    inputs:
-      unique-id:
-        required: true
-        type: string
-      is-self-hosted:
-        required: true
-        type: boolean
-
-jobs:
-  # In the unlikely event a self-hosted runner was selected and reserved but it
-  # goes down before the workload starts, cancel the workflow run.
-  runner-timeout:
-    if: ${{ inputs.is-self-hosted }}
-    name: Detect Runner Timeout
-    runs-on: ubuntu-latest
-    steps:
-      - uses: delan/servo-ci@main
-      - name: Cancel if workload job is still queued
-        run: |
-          ci runner timeout \
-            --wait-time 120 \
-            --unique-id '${{ inputs.unique-id }}' \
-            --github-repository '${{ github.repository }}' \
-            --github-run-id '${{ github.run_id }}' \
-            --github-token '${{ secrets.GITHUB_TOKEN }}'