fix(cwl): Set LogEventFilter when constructing LiveTailSession

[keeganirby]

Problem

LogEventFilter is an optional configuration parameter when building a LiveTailSession. Currently, the Constructor is not actually setting this property so it is always undefined. This means that if a user sets a Filter pattern, it will not be applied.

Solution

Set the property in LiveTailSession Constructor.
Add missing unit tests to validate that LiveTailSession config values are set properly. Testing via buildStartLiveTailCommand because this is what actually gets sent to the CWL backend to start a LiveTailSession.

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License: I confirm that my contribution is made under the terms of the Apache 2.0 license.

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