fix(files-matcher): build patterns from the normalized file spec

[NotAFlightRisk]

I had exclude: ["dist/"] in a tsconfig and createFilesMatcher still returned a config for dist/index.d.ts, where tsc --listFiles on the same project doesnt list it. outDir: "dist/" goes the same way.

Its the trailing slash. tsc normalizes a spec into path components before building the pattern so the slash stops existing, and get-tsconfig builds off the raw string instead. Exclude patterns already append ($|/) to prune a directory's subtree, so with the spec's own slash in front of that the pattern ends up wanting two. Goes wrong the other way as well - files: ["index.ts/"] drops a root file tsc does pick up.

And there's a second fix here too, because the first one cant go in without it. tsc drops an include ending in ** (src/** is TS5010) while the matcher reads it as everything under src. Leave it and src/**/ goes from matching nothing to matching the lot. Both rules sit within ten lines of the one isImplicitGlobPattern already came from.

Most of the +155 is tests, the source change is 16 lines. Same on 4.14.3 and 5.0.0-beta.6.