Removed files from local sources remain in the part

[lengau]

Bug Description

See: canonical/charmcraft#710

Deleting a file from a local source doesn't remove it from the part's src directory

To Reproduce

See: canonical/charmcraft#710

part yaml

parts:
  data:
    plugin: dump
    source: .

Relevant log output

n/a

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3421.

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