[CP-23429] merge insights-controller into main chart

[dmepham]

Description

There isn't a lot of benefit to having a subchart in the cloudzero-agent chart now that they're always used together. this PR does two things:

1. merges the insights-controller chart into the cloudzero-agent chart, and
2. renames the tags map to insightsController

todo

• webhooks should be created based on resource enablement, not if they exist in the webhooks array
• insightsController.enabled should turn off all related components
• update documentation to reflect tags -> insightsController name change

Checklist

• I have added documentation for new/changed functionality in this PR
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main

[dmepham]

I'm making this change because I want to make sure that we choose a name that will make sense for future changes. the insights-controller can potentially handle much more than labels and annotations, so I don't want to add a confusing name.
the downside is that this is less descriptive for users who are looking to configure labels/annotations