Fix install and probe bugs

[willmostly]

Description

This fixes a nil pointer issue when Helm evaluates the deployment template before the secrets template creates trino-gateway-configuration. It also fixes an issue with the liveness and readiness probe templates.

Additional context and related issues

The nil pointer issue may result in an error message like

Error: template: trino-gateway/templates/deployment.yaml:20:71: executing "trino-gateway/templates/deployment.yaml" at <"trino-gateway-configuration">: nil pointer evaluating interface {}.resourceVersion

The templating issue results in a livenessProbe like:

livenessProbe:
            httpGet:
                path: /
                port: 9082
            initialDelaySeconds: .Values.livenessProbe.initialDelaySeconds
            periodSeconds: .Values.livenessProbe.periodSeconds
            failureThreshold: .Values.livenessProbe.failureThreshold
            timeoutSeconds: .Values.livenessProbe.timeoutSeconds

Release notes

( ) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required. Please propose a release note for me.
(x) Release notes are required, with the following suggested text:

* Fix issue with Helm deployment when configuration secret not create
* Pass template values through to readiness and liveness probes

[ebyhr]

@willmostly Please use Rebase and merge when merging the PR.

[mosabua]

Or if you need to use squash and merge - make sure to reword message properly and remove the PR number in the title - see https://trino.io/development/process#maintainer-processes

also cc @vishalya and @Chaho12