Add automated UI tests for case insensitive matching of completion items

[vaisakhkannan]

Fixes #953
Added four more automated UI tests to verify matching completion items in the server.env and bootstrap.properties files.

Current Scenarios we have right now:

• Full capital case letters insert into server.env
• Full lowercase letters insert into bootstrap.properties

I have added 4 more scenarios. Below are the 4 scenarios, and I have added tests for them, so they are included in this PR.

1. Full lowercase letters insert into server.env
2. A mix of lowercase and capital case letters insert into server.env
3. Full capital case letters insert into bootstrap.properties
4. A mix of lowercase and capital case letters insert into bootstrap.properties

[vaisakhkannan]

Recording of the test testInsertLibertyConfigIntoServerEnvForLowerCase

testInsertLibertyConfigIntoServerEnvForLowerCase.mov

Recording of the test testInsertLibertyConfigIntoServerEnvForMixOfCases

testInsertLibertyConfigIntoServerEnvForMixOfCases.mov

Recording of the test testInsertLibertyConfigIntoBootstrapPropsForCapitalCase

testInsertLibertyConfigIntoBootstrapPropsForCapitalCase.mov

Recording of the test testInsertLibertyConfigIntoBootstrapPropsForMixOfCases

testInsertLibertyConfigIntoBootstrapPropsForMixOfCases.mov

[dessina-devasia]

Looks good to me

[mrglavas]

See suggested change related to the use of String.toUpperCase() / String.toLowerCase(). Ensures that capitalization rules are applied consistently regardless of the environment (locale) that the tests are run in.

[mrglavas]

@vaisakhkannan Looks good. Thanks for providing the videos with the PR. Watching them was very helpful to understand the scenarios being tested here and also demonstrated that they work correctly.

[dessina-devasia]

Looks good to me