WW-5310 Fixes broken support for Fragments in <s:url/> tag

[lukaszlenart]

Closes WW-5310

[sonarcloud]

Quality Gate failed

Failed conditions
8 Security Hotspots
28.6% Coverage on New Code (required ≥ 80%)
4.0% Duplication on New Code (required ≤ 3%)
E Reliability Rating on New Code (required ≥ A)
E Security Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[rgielen]

I've crosschecked https://datatracker.ietf.org/doc/html/rfc3986#section-2.1 to understand whether it's our business to take care of unencoded '=' in value of k/v pair, but it looks like it SHOULD be encoded, but is not required. Splitting at first '=' only seems to be legit and preferred behaviour.

That said, the fix correctly addresses both the improved handling for unencoded '=' as well as proper dealing with the fragment part 👍