Revert "Revert "fix: stop overriding team-operator image when not explicitly configured""

[amdove]

Re-applies #155: When team_operator_image is not set in ptd.yaml, PTD now passes no image override to Helm, allowing the chart to use its appVersion default. This also updates the default chart version to v1.16.2.

Previously, even when team_operator_chart_version was pinned, PTD always overrode the operator image to posit/ptd-team-operator:latest. This meant chart versions controlled Helm values but not the actual operator image running in clusters.

Changes

1. Stop overriding team-operator image — When team_operator_image is not explicitly set, PTD no longer passes image configuration to Helm, allowing the chart's appVersion to control the image tag.

2. Update default chart version to v1.16.2 — All clusters without an explicit team_operator_chart_version will use v1.16.2, which includes the fixes from posit-dev/team-operator#108.

Prerequisites (completed):

• team-operator chart fix released (posit-dev/team-operator#108) — fixes wrong repo name and adds semantic version Docker tags

What changes for existing clusters

After merging this PR and running ptd ensure, clusters will:

• Use chart version v1.16.2 by default (unless explicitly pinned to another version)
• Pull the image version matching their chart's appVersion, instead of always pulling posit/ptd-team-operator:latest

IMPORTANT: Chart versions before v1.16.2 should not be used. Those versions have two bugs that cause ImagePullBackOff when PTD doesn't override the image. Both issues were fixed in PR #108.