Remove matchdep dependency

[desrosj]

The matchdep dependency has not been updated in over 7 years. The upstream repository has not run automated testing on a Node.js version higher than 10.x. This replaces the package with a custom Grunt function.

Previously introduced in Core-25243.

Trac ticket: https://core.trac.wordpress.org/ticket/62221.

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[desrosj]

Merged in https://core.trac.wordpress.org/changeset/59797.