Shorten Symfony Recipe URL Cache Keys

[cjunge]

Fixes #830.

This change replaces the simple generated composer filesystem cache key with a slightly shorter one only for the Symfony Recipes repos.

/home/cameron/.cache/composer/repo/flex/https---api.github.com-repos-symfony-recipes-contrib-contents-friendsofsymfony.elastica-bundle.5.0.json-ref-flex-main
becomes
/home/cameron/.cache/composer/repo/flex/sf-recipes-contrib-friendsofsymfony.elastica-bundle.5.0.json-ref-flex-main

This won't fix other recipe files hosted on long paths.

[cjunge]

The failing tests appear to be due to an API change in Composer, unrelated to my code changes. Should I fix these?

        $realPkg = new Package('real', '1.0.0', '1.0.0');
        $realPkgLink = new Link('lorem', 'real', class_exists(MatchAllConstraint::class) ? new MatchAllConstraint() : null, 'wraps', '1.0.0');

        $virtualPkgFoo = new Package('pack_foo', '1.0.0', '1.0.0');
        $virtualPkgFoo->setType('symfony-pack');
        $virtualPkgFoo->setRequires([$realPkgLink]);

        $realPkg = new Package('real', '1.0.0', '1.0.0');
        $realPkgLink = new Link('lorem', 'real', class_exists(MatchAllConstraint::class) ? new MatchAllConstraint() : null, 'wraps', '1.0.0');

        $virtualPkgFoo = new Package('pack_foo', '1.0.0', '1.0.0');
        $virtualPkgFoo->setType('symfony-pack');
        $virtualPkgFoo->setRequires(['real' => $realPkgLink]);

[nicolas-grekas]

Thank you @cjunge.