telco-hub: add observability prereq CRs

[jmontesi]

Adds an Object Bucket Claim along with its Secret as well as the copy of the global pull secret into the observability namespace. The steps to create these CRs are explained in the ACM readme.

Also, corrects the format of some Markdown lists.

[openshift-ci]

Hi @jmontesi. Thanks for your PR.

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[imiller0]

/ok-to-test

[imiller0]

Can you rebase please

[openshift-ci]

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