fix: [#4684] ESLint issues in botframework-streaming

[sw-joelmut]

Addresses #4684
#minor

Description

This PR fixes all the new ESLint errors and warnings that appeared after the ESLint packages' upgrade in the botframework-streaming project.

Specific Changes

• Removed 'only-warn' plugin from 'botframework-streaming/eslint.config.cjs' and its dependency.
• All updated TS and JS files were due to prettier, mocha, and jsdoc new rules.
• We replaced all test assertions that use expect(...).to.be.undefined / to.be.true / to.be.false, to to.equal(undefined | true | false) due to mocha rule.
• Separated a few tests describe in different files due to mocha rule.

Testing

The following image shows that there are no more ESLint issues, and the tests are passing after the changes.

[coveralls]

Pull Request Test Coverage Report for Build 12431991684

Details

• 23 of 24 (95.83%) changed or added relevant lines in 12 files are covered.
• 4 unchanged lines in 4 files lost coverage.
• Overall coverage remained the same at 84.625%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botframework-streaming/src/webSocket/browserWebSocket.ts	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-streaming/src/webSocket/nodeWebSocket.ts	1	87.76%
libraries/botframework-streaming/src/namedPipe/namedPipeClient.ts	1	45.0%
libraries/botframework-streaming/src/webSocket/browserWebSocket.ts	1	42.42%
libraries/botframework-streaming/src/contentStream.ts	1	75.0%

Totals
Change from base Build 12259066809:	0.0%
Covered Lines:	20513
Relevant Lines:	23091

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💛 - Coveralls