fix: fix skip-install option to bootstrap command

[chmouel]

Updated the bootstrap process to allow users to bypass the installation check. This change prevented the command from failing when Pipelines as Code is already present in the cluster, enabling users to skip the automatic installation step when it is not required.

tested as working on openshift cluster:

before:

%   tkn pac bootstrap github-app \
    -n pipelines-as-code \
    --skip-install \
    --route-url "https://$(oc get route pipelines-as-code-controller -n pipelines-as-code -o jsonpath='{.spec.host}')" \
    --github-application-name "blahblah \
    --github-organization-name org
Error: pipelines as Code is already installed, please pass --force-install to override existin

after:

working

Closes #2708

📝 Description of the Change

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Fixes #

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.12%. Comparing base (357d970) to head (98b90fa).

Files with missing lines	Patch %	Lines
pkg/cmd/tknpac/bootstrap/bootstrap.go	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2709   +/-   ##
=======================================
  Coverage   59.12%   59.12%           
=======================================
  Files         208      208           
  Lines       20512    20512           
=======================================
  Hits        12127    12127           
  Misses       7612     7612           
  Partials      773      773           

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