search: update integration tests for parser migration

Created by: rvantonder

Happy to say that the parser migration passes all of the existing search integration tests. The new parser is stricter about enforcing that type:file is specified with stable:yes (addresses https://github.com/sourcegraph/sourcegraph/issues/9715), so the relevant tests are updated here. There are also some queries that have stable:yes, that we don't technically support yet, so I have updated those tests as well.

The assumption from here on out is that these tests work consistently with the new parser, until I/we put @unknwon's testing work into CI.

There is one discrepancy for a test that returns a slightly different suggested query for a particular alert (ordering is different). This is too low value to try and make consistent, but just noting it.

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