Backport #39721 by @bircni
Fixes a few Actions bugs where user input or nondeterminism caused
failures:
- The job log view indexed task steps with the client-supplied cursor
step without a bounds check, so an out-of-range value panicked and
returned a 500.
- Workflow activity type filters (`types:`) were compiled with
`glob.MustCompile`, so an invalid pattern in a workflow file panicked
during event detection. Invalid patterns now simply don't match.
- Listing workflow runs with an unknown `actor` returned a 500; it now
returns 404.
- The v4 artifact `ListArtifacts` response was built by ranging over a
map, so its order changed between calls. It now follows database order.
- The error from marshalling a workflow job when inserting run jobs was
silently ignored.
Co-authored-by: bircni <bircni@icloud.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
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