Harmonise failed transform behaviour

[Martin-Idel-SI]

The current behaviour on missing transform is pretty uneven. Some displays show something, some set a status error (or both). This PR aims to straighten out this behaviour across displays. The wanted behaviour would be:

• Don't show anything when transform is missing
• Show a Status error telling the user what's going on
• With debug logging enabled, also print to the console

Two displays exhibit different behaviour as before:

• TF display shows a warning status
• Grid display shows the grid nevertheless. This is also necessary to not have an empty window when loading rviz without any transform.

CI:

• Linux
• Linux-aarch64
• macOS
• Windows

[wjwwood]

Is it the case that the grid's behavior could change too when/if we fix the tf2 issue where a transform to the same frame returns an error rather than identity?

[wjwwood]

lgtm, question about the grid's default behavior aside this is an incremental improvement, thanks!