fix(external-router): extract daff paths ignoring full path

[griest024]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

daffExtractDaffPathData ignores all routes in the path except the last, incorrectly building the path when the last route is an empty path route.

What is the new behavior?

daffExtractDaffPathData computes the path from all routes in the path from root.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[griest024]

@damienwebdev is this the behavior that we actually want?

[damienwebdev]

lgtm