Fix ChatConversationalAgentOutputParser cannot handle markdown in the JSON

[micahriggan]

The output parser doesn't handle when the AI's action_input contains markdown, or ``` backticks really, as it's matching on the first set of backticks it finds rather than the last.

Tested with yarn test:single langchain/src/agents/tests/chat_output_parser.test.ts

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[micahriggan]

For the lint, how should I resolve the no-unused-expressions on the tests calling expect?

[nfcampos]

@micahriggan I've fixed it, it was missing the () for doing the function call

[NJordan72]

FWIW, I think StructuredOutputParser has the same problem

[micahriggan]

@NJordan72 agreed, just took a look at that file and it has the same issue.

[micahriggan]

Anything else I need to do on this one? @nfcampos

[nfcampos]

Thanks, merging this now. The same issue in StructuredOutputParser is resolved in another PR