Enable interactive run for watch mode

[connectdotz]

This PR mainly implements TestItem profile support using vscode.TestRunTag and enable TestExplorer to run tests on demand for all workspaces including watch-mode:

1. each test item can enable/disable run/debug profile independently via vscode.TestRunTag
2. enable run profile for all configs, even "watch" mode. Why? There seems to be a common confusion for watch mode users when the watcher does not function as they anticipated. This will give users the ability to run any tests regardless how jest-watcher behave (Test Explorer does not convert failed test to passing after save #757). However, to prevent the output got overridden by each other, we created a separate run queue with different output file names.
3. allow debugging test on the test file level, i.e. no explicit test name. This could be useful if the test block can not be identified. Will use the wildcard for 'testNamePattern' in this case.
4. remove the warning popup when no debug config is found.
5. in order to increase compatibility with known platforms (such as angular), move run test by-path to by-pattern when running test by explicit test file.

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fixes #757

[coveralls]

Pull Request Test Coverage Report for Build 1568071107

• 70 of 70 (100.0%) changed or added relevant lines in 8 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.04%) to 95.363%

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Files with Coverage Reduction	New Missed Lines	%
src/JestExt/core.ts	1	98.46%
src/test-provider/test-provider.ts	1	97.5%

Totals
Change from base Build 1542100359:	0.04%
Covered Lines:	2568
Relevant Lines:	2639

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💛 - Coveralls