Improve failure status message when attempting to upgrade across major versions or downgrade

[everettraven]

As part of #533 we highlight the new spec.upgradeConstraintPolicy behavior and how when it is set to Enforce semver is followed and upgrades across a major version are not able to be performed.

Stepping through the process, I found the status message that is displayed when attempting to do this is:

  - lastTransitionTime: "2023-11-13T14:43:09Z"
    message: 'constraints not satisfiable: coastal package uniqueness permits at most
      1 of coastal-coastal-coastal.v2.0.0, coastal-coastal-coastal.v1.1.0; installed
      package coastal is mandatory; installed package coastal requires at least one
      of coastal-coastal-coastal.v1.1.0; required package coastal is mandatory; required
      package coastal requires at least one of coastal-coastal-coastal.v2.0.0'
    observedGeneration: 4
    reason: ResolutionFailed
    status: "False"
    type: Resolved
  - lastTransitionTime: "2023-11-13T14:43:09Z"
    message: installation has not been attempted as resolution is unsatisfiable
    observedGeneration: 4
    reason: InstallationStatusUnknown
    status: Unknown
    type: Installed

(the inverse is displayed when attempting a downgrade)

While I could grok from installed package coastal requires at least one of coastal-coastal-coastal.v1.1.0 followed by required package coastal requires at least one of coastal-coastal-coastal.v2.0.0 that it was trying to inform me I could not upgrade across major versions I don't think this message is very user friendly. I'm not sure I would have easily discerned that this is saying "I can't upgrade across major versions" if I wasn't explicitly exercising this functionality.

If possible, I think we should try to improve this message and have it explicitly highlight that the resolution failure is because of major version boundaries or a downgrade is being attempted. If we want to keep the resolution failure message this verbose, that is fine by me but we should at least convey a more useful message in the Installed condition message.

Instead of installation has not been attempted as resolution is unsatisfiable I'm thinking something more along the lines of:

Installation has not been attempted as resolution is unsatisfiable. 
Attempting to { cross major version boundaries || downgrade } from vX.Y.Z to vX.Y.Z, which is not allowed when spec.upgradeConstraintPolicy=Enforce. 
To force this behavior, set spec.upgradeConstraintPolicy=Ignore.