Add support for upgrade/rollback functionality for OCP

[jordigilh]

• Adds upgrade functionality in the chart by running a job that applies the changes post-upgrade/post-rollback. Alternatively, when the operator is disabled via chart value, a job is triggered pre-upgrade/pre-rollback to delete the CR and ensure that it is processed by the operator before the subscription is removed.
• Fixes various issues in the NOTES.txt where some of the values displayed were never processed and always showed the default value.
• Simplification and refactoring of the helper charts to reduce maintenance costs.
• Fixes #160 . When the number of characters exceed the limit of 63, the name will be trim from the beginning. That limit also factors in the 6 random characters appended by the controller to make each pod name unique. Example:

  estrator-mega-super-sample-foo-bar-knativeeventing-delete-rf66w   0/1     Terminating         0          92s
  hestrator-mega-super-sample-foo-bar-knativeserving-delete-jnkxs   0/1     Terminating         0          41s
  hestrator-mega-super-sample-foo-bar-knativeserving-delete-jnkxs   0/1     Terminating         0          41s
  rator-mega-super-sample-foo-bar-sonataflowplatform-delete-mx9nt   0/1     Terminating         0          13s
  rator-mega-super-sample-foo-bar-sonataflowplatform-delete-mx9nt   0/1     Terminating         0          13s
  orchestrator-sample-backstage-install-wr8c4                       0/1     Pending             0          0s
  orchestrator-sample-backstage-install-wr8c4                       0/1     Pending             0          0s

@masayag PTAL.