Update OLM installer bundles for pgAdmin API updates

[tjmoore4]

Checklist:

• Have you added an explanation of what your changes do and why you'd like them to be included?
• Have you updated or added documentation for the change, as applicable?
• Have you tested your changes on all related environments with successful results, as applicable?
  • Have you added automated tests?

Type of Changes:

• New feature
• Bug fix
• Documentation
• Testing enhancement
• Other

What is the new behavior (if this is a feature change)?

• Breaking change (fix or feature that would cause existing functionality to change)
  This PR adds a new OLM example for the pgAdmin CRD and updates the bundle description file.

Other Information:

[jmckulk]

Would a comment about "This will grab all postgresclusters" be helpful?

[tjmoore4]

Might be a good idea. I thought about it a bit, but we don't have anything similar in our other examples. I can try a test and see how it looks.

[tjmoore4]

To follow up, I did a test and our current bundle generation method strips out comments, so I don't know that there's a simple way to add that at the moment.

[tsykoduk]

+1 with a quick look I saw nothing that jumped out at me - is there something that you want me to focus on?

[tjmoore4]

Thanks for taking a look. Mainly the line in installers/olm/description.md. Is that sufficient or is there anything else you think is worth mentioning there?

[jmckulk]

lgtm technically - wording seems fine to me, but will leave that to others