AV-2034: Fix header search breaking on consecutive searches

[bzar]

• Fix path.current containing invalid characters
• Set search form action URL explicitly to remove accumulating garbage
• Improve string handling in form submit
• Removed ckanext-datarequests

[codecov]

Codecov Report

Patch coverage: 16.66% and no project coverage change.

Comparison is base (910217c) 23.42% compared to head (4c854e5) 23.42%.
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2037   +/-   ##
=======================================
  Coverage   23.42%   23.42%           
=======================================
  Files          43       43           
  Lines        6031     6031           
  Branches       34       34           
=======================================
  Hits         1413     1413           
  Misses       4618     4618           

Flag	Coverage Δ
cdk	93.10% <ø> (ø)
ckan	18.01% <16.66%> (ø)

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Files Changed	Coverage Δ
cdk/lib/ckan-stack.ts	91.06% <ø> (ø)
ckan/ckanext/ckanext-ytp_main/ckanext/ytp/cli.py	23.21% <0.00%> (ø)
ckan/ckanext/ckanext-ytp_main/ckanext/ytp/dcat.py	8.83% <0.00%> (ø)
...kan/ckanext/ckanext-ytp_main/ckanext/ytp/plugin.py	37.10% <100.00%> (ø)

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