Ant-based test: Parameterize query for fn:collection()

[AirQuick]

Summary

test/ant/worker/generate.xsl uses fn:collection() to collect XSpec files. URI query parameter is hardcoded:

xspec/test/ant/worker/generate.xsl

Line 57 in 66103d7

select="concat($XSPECFILES-DIR-URI, '?select=*.xspec')" />

This pull request parameterizes it.

Why

With this change, you can quickly experiment query parameters such as recursive option:

C:\xspec>test\run-xspec-tests-ant.cmd -Dxspecfiles.dir="C:\test" -Dxspecfiles.dir.url.query="select=*.xspec;recurse=yes"

Scope of this change

This change pertains only to CI tests. Nothing is changed in XSpec itself.

Test

I ran the following commands on the current master and on this pr branch

C:\xspec>test\run-xspec-tests-ant.cmd -Dthread.count=1 -logfile "test.log"
C:\xspec>test\end-to-end\run-e2e-tests.cmd -Dthread.count=1 -logfile "e2e.log"

and compared the logs to verify that there's no unignorable difference between the current master and this pr branch.