Add Readiness/Liveness probes to caikit-ootb

[dtrifiro]

Add liveness/readiness probes and env variables

Related to:

• manifests: misc improvements caikit-tgis-serving#205
• tgis-standalone/caikit-standalone manifests caikit-tgis-serving#186

Description

How Has This Been Tested?

Manifest has been deployed in a fresh cluster with a fresh kserve install: opendatahub-io/caikit-tgis-serving#220

Test Impact

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit tests & storybook for related changes)

[dtrifiro]

CI failure seems unrelated:

[dpanshug]

/retest

[lucferbux]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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