Since all resources are uploaded in the separate workflow anyway there
is not much point in passing the options and uploading blob reports as a
separate step.
* Fix report downloading from Azure (reports are now zipped)
* Extracted upload logic into an action
* Extracted PR number file generation into its own job
Fixes
```
Notice: Report url: https://mspwblobreport.z1.web.core.windows.net/run-5533005176-1-a0b0752662f8af5f841ff7a65b04d02066474ff2/index.html
ReferenceError: fs is not defined
at eval (eval at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v6/dist/index.js:15143:16), <anonymous>:30:18)
at callAsyncFunction (/home/runner/work/_actions/actions/github-script/v6/dist/index.js:15144:12)
at main (/home/runner/work/_actions/actions/github-script/v6/dist/index.js:15236:26)
at /home/runner/work/_actions/actions/github-script/v6/dist/index.js:15217:1
at /home/runner/work/_actions/actions/github-script/v6/dist/index.js:15268:3
at Object.<anonymous> (/home/runner/work/_actions/actions/github-script/v6/dist/index.js:152[71](https://github.com/microsoft/playwright/actions/runs/5533535965/jobs/10097205178#step:12:72):12)
at Module._compile (node:internal/modules/cjs/loader:1105:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
```
The check summary has a link to the report and a link to the merge
workflow run. Otherwise it's very hard to tell which merge workflow
corresponds to given PR.
Downloading 457Mb of reports with traces (for tracing tests) takes >3
minutes, uploading it to Azure takes >5 minutes which easily exceeds 10
minutes budget.
For some reason pull_requests field on workflow_run is empty for pull
requests created from branches in forked repositories, see
https://github.com/orgs/community/discussions/25220. As a workaround we
store triggering pull request number in a file.
* Moved report merging and publishing logic into create_test_report.yml
shared between all workflows
* Merged reports are now published for try jobs on pull requests too. In
order to achieve that the logic had to be extracted into a separate
workflow triggered by
[workflow_run](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_run),
this way it can access secrets even if the original workflow was not
able to.
* The blob report data flow is different depending on whether the
workflow is triggered by a pull request or a push:
- For `pull_request` the workflow doesn't have access to the secrets it
uploads the blob report to the GitHub
artifact storage. Later on the merge workflow uploads that blob report
to Azure blob storage.
- Workflows triggered by `push` event can read secrets. They upload blob
report directly to Azure blob storage
and the merge workflow downloads the report from there rather than from
GitHub artifacts.
