URL encode directory names in "all files in zip" link

[tchaikov]

Previously, directory names containing special characters (e.g., "[" or "]") would cause HTTP 400 errors due to illegal path characters. Now properly percent-encoding the directory name in the URL to handle special characters.

See JENKINS-XXXXX.

Testing done

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[timja]

Do spaces in the directory names still work?

We had a similar issue in the junit plugin and rawEncode had to be used instead of urlEncode

jenkinsci/junit-plugin#660 (comment)

jenkinsci/junit-plugin#661

and finally:
jenkinsci/junit-plugin#668

[timja]

Could you please include how its been tested in the testing done, including the cases you've tried