fixing search and replace with cell outputs

[BrunoNeira-cmu]

References

Builds from #16157
Resolves #15966

Code changes

• updated highlighting logic in genericsearchprovider.ts to support highlighting in cell outputs
• updated searchmodel.ts to support disabling replace button when current match is in cell output

User-facing changes

• highlights search matches even if matches are in cell outputs
• disables the replace button when the current match is in the cell output.

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[BrunoNeira-cmu]

Currently draft PR because I'm working on disabling the Replace All button when all matches in are in cell outputs.