Add “when” directive support when ignore files using "files.exclude" ignore patten

[tmulin]

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• VSCode Version: 1.30.1
• OS Version: Windows_NT x64 10.0.17763
• Extension Version: 1.47.0
• System Language: zh-CN
• SVN Version: 1.11.0

Issue

files.exclude as below described ignore all js files instead of only ignore "js" file when only exists "ts" files having same name.

Steps to Reproduce

1. Use VsCode working a web project use typescript
2. The project with “files.exclude" settings below to ignore js files which typescript generated in same location:

"files.exclude": {
        "**/*.js": {
            "when": "$(basename).ts"
        }
    }

3. When there is some isolate js files which is not generated from typescript (although this is not a properly use case)，svn plugin also ignore the isolate js files

SVN Output

$ svn stat --xml --no-ignore --ignore-externals --show-updates
$ svn info --xml

Direct Use SVN Command Line Output

svn stat --no-ignore --ignore-externals M api\event.js

Screenshots