Added switch and delete icons on manage contexts show-pick and done refactoring

[dgolovin]

Fixes #2598.

• added switch and delete icons on manage contexts show-pick and done refactoring
• merge main branch
• added kubeconfig tree item into app explorer and open kubeconfig file command
• changed tooltip value
• reverted kubeconfig file info on tree item
• remove unused import
• changed odo initialization
• added onDidAccept listener for getting selected value from quick pick
• title changed
• removed await
• addressed the review comments
• Add error handling to switch context command execution
• Resolve switch context command to null when cancelled by user

[codecov]

Codecov Report

Base: 34.53% // Head: 34.34% // Decreases project coverage by -0.18% ⚠️

Coverage data is based on head (29067d8) compared to base (8382031).
Patch coverage: 2.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2684      +/-   ##
==========================================
- Coverage   34.53%   34.34%   -0.19%     
==========================================
  Files          68       68              
  Lines        4019     4041      +22     
  Branches      714      715       +1     
==========================================
  Hits         1388     1388              
- Misses       2631     2653      +22     

Impacted Files	Coverage Δ
src/odo/command.ts	18.58% <0.00%> (-0.25%)	⬇️
src/util/kubeUtils.ts	54.23% <ø> (ø)
src/openshift/cluster.ts	11.20% <2.94%> (-0.98%)	⬇️

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