ci(e2e): unify Linux + Windows UI tests into one parallel workflow #5

Job	Run time
Lint & Checkstyle	39s
Build VSIX (Linux)	2m 10s
Build VSIX (Windows)	4m 6s
Discover E2E Plans	3s
E2E Linux (java-dep-refresh-generated-files)	2m 9s
E2E Linux (java-dep-new-types)	3m 18s
E2E Linux (java-dep-view-modes)	2m 35s
E2E Linux (java-dep-project-explorer)	2m 30s
E2E Linux (java-dep-file-operations)	3m 20s
E2E Linux (java-dep-build-lifecycle)	2m 53s
E2E Linux (java-dep-autorefresh-targeted)	1m 57s
E2E Windows (java-dep-build-lifecycle)	3m 20s
E2E Windows (java-dep-autorefresh-targeted)	1m 17s
E2E Windows (java-dep-refresh-generated-files)	2m 40s
E2E Windows (java-dep-new-types)	5m 4s
E2E Windows (java-dep-file-operations)	4m 2s
E2E Windows (java-dep-project-explorer)	3m 22s
E2E Windows (java-dep-view-modes)	3m 1s
E2E Summary	25s
Lint & Checkstyle	39s
Build VSIX (Windows)	4m 6s
Discover E2E Plans	3s
Build VSIX (Linux)	2m 10s
E2E Linux (java-dep-build-lifecycle)	2m 53s
E2E Windows (java-dep-autorefresh-targeted)	2m 25s
E2E Windows (java-dep-file-operations)	4m 2s
E2E Linux (java-dep-autorefresh-targeted)	1m 57s
E2E Windows (java-dep-build-lifecycle)	3m 20s
E2E Windows (java-dep-view-modes)	3m 1s
E2E Linux (java-dep-new-types)	3m 18s
E2E Windows (java-dep-refresh-generated-files)	2m 40s
E2E Windows (java-dep-new-types)	5m 4s
E2E Linux (java-dep-file-operations)	3m 20s
E2E Windows (java-dep-project-explorer)	3m 22s
E2E Linux (java-dep-refresh-generated-files)	2m 9s
E2E Linux (java-dep-project-explorer)	2m 30s
E2E Linux (java-dep-view-modes)	2m 35s
E2E Summary	19s
	1h 38m 44s

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