Hub and Remote tasks settings

[chmouel]

• let user change the tekton hub base url via configmap setting
• let user be able to disable all remote tasks via configmap setting

Part of https://issues.redhat.com/browse/SRVKP-1748

[chmouel]

/retest

[codecov-commenter]

Codecov Report

Merging #354 (e931641) into main (38683ee) will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #354      +/-   ##
==========================================
+ Coverage   70.37%   70.49%   +0.12%     
==========================================
  Files          50       50              
  Lines        2562     2559       -3     
==========================================
+ Hits         1803     1804       +1     
+ Misses        581      579       -2     
+ Partials      178      176       -2     

Impacted Files	Coverage Δ
pkg/hub/get.go	82.85% <100.00%> (+7.85%)	⬆️
pkg/pipelineascode/pipelineascode.go	60.37% <100.00%> (ø)
pkg/provider/bitbucketcloud/events.go	79.26% <100.00%> (ø)
pkg/consoleui/tektondashboard.go	66.66% <0.00%> (-8.34%)	⬇️
pkg/kubeinteraction/cleanups.go	69.23% <0.00%> (+1.23%)	⬆️

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