ci: extract url coverage from all

[alandefreitas]

Use the same process as boost-ci to generate and upload coverage. It generates an all.info file with information about all boost libraries and filters the files in /libs/url/. This fixes a problem with the --include pattern we used to use.

fix #821

[cppalliance-bot]

GCOVR code coverage report https://825.url.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://825.url.prtest2.cppalliance.org/genhtml/index.html Coverage Diff https://825.url.prtest2.cppalliance.org/gcovr/coverage_diff.txt

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.24%. Comparing base (60d5ee2) to head (0a27eeb).

Additional details and impacted files

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[cppalliance-bot]

GCOVR code coverage report https://825.url.prtest2.cppalliance.org/gcovr/index.html
LCOV code coverage report https://825.url.prtest2.cppalliance.org/genhtml/index.html Coverage Diff https://825.url.prtest2.cppalliance.org/gcovr/coverage_diff.txt