Update Red Hat OpenShift support statement

[conceptualshark]

Description

From feedback on the OpenShift support statement: "does this documentation imply that for new installations we will no longer recommend OpenShift?" Cleaning this up to make it more explicit what is and is not supported. This uses the life cycle phases defined by Red Hat on top of the provided table to provide more specific information on support.

Original suggestion: "We support only the OpenShift versions that are currently supported by Red Hat—that is, versions within their End of Support Date. For more details, please refer to the Red Hat OpenShift Container Platform Life Cycle Policy."

Internal slack: https://camunda.slack.com/archives/C01Q05D6YUU/p1731998800535919

When should this change go live?

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, and I've assigned @camunda/tech-writers as a reviewer.

[conceptualshark]

I cleaned up this phrasing here from the original suggestion, but think it captures the actual support a bit more specifically. Also backported through 8.5, as prior we seem to use a different method of communicating these dates/versions.

[conceptualshark]

@theburi Can I get a final review here? The wording was changed from the initial suggestion and I'd like to make sure it still works. Thanks!

[conceptualshark]

adding @camunda/tech-writers to get some additional feedback on the wording here, I'd like to get this merged if it seems to be the right direction for clarifying the support window.

[mesellings]

Lgtm - only one non-blocking suggestion 👍

[mesellings]

Suggested change

	Camunda supports OpenShift versions that fall within the Red Hat General Availability, Full Support, and Maintenance Support life cycle phases. For more information, refer to the [Red Hat OpenShift Container Platform Life Cycle Policy](https://access.redhat.com/support/policy/updates/openshift).
	Camunda 8 only supports OpenShift versions in Red Hat General Availability, Full Support, and Maintenance Support life cycle phases. For more information, refer to the [Red Hat OpenShift Container Platform Life Cycle Policy](https://access.redhat.com/support/policy/updates/openshift).

Wording lgtm, just an idea for rewording here but feel free to ignore as I'm not sure it's any better - I did add Camunda 8 in however as I wasn't sure if we should clarify whether we mean Camunda (the company) supports..., or Camunda 8 (the software) supports...

[conceptualshark]

I like these suggestions - I've gone ahead and added them in, thank you!

[mesellings]

Lgtm 👍 🚀