Make Dimension.label source of truth for Dimension identity

[philippjfr]

Implements https://github.com/holoviz/holoviews/issues/6260

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 17 lines in your changes missing coverage. Please review.

Project coverage is 88.52%. Comparing base (9cc87fe) to head (7b0f15f). Report is 9 commits behind head on main.

Files	Patch %	Lines
holoviews/plotting/mixins.py	61.53%	5 Missing :warning:
holoviews/plotting/mpl/chart.py	69.23%	4 Missing :warning:
holoviews/plotting/bokeh/graphs.py	0.00%	2 Missing :warning:
holoviews/plotting/mpl/graphs.py	0.00%	2 Missing :warning:
holoviews/plotting/util.py	71.42%	2 Missing :warning:
holoviews/plotting/bokeh/path.py	50.00%	1 Missing :warning:
holoviews/plotting/plotly/chart.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6262 +/- ## ========================================== + Coverage 88.47% 88.52% +0.04% ========================================== Files 323 323 Lines 67647 67906 +259 ========================================== + Hits 59853 60116 +263 + Misses 7794 7790 -4 ```

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[philippjfr]

Is this an ok (rough) understanding?

Yes.

How thoroughly have you checked the codebase for this find and replace? The code still seems to use name for range lookup.

Clearly not quite thoroughly enough, will do another more exhaustive check now.

Have you checked if hvplot / GeoViews need updating too?

Yes.

[philippjfr]

Did miss quite a few. Will scan more thoroughly one more time. Note that this only affects plotting code, so e.g. this isn't affected:

holoviews/holoviews/operation/normalization.py

Line 109 in c8e7f5f

 return {d.name: element.range(d.name, self.data_range) 

[philippjfr]

Okay, quite confident now, thoroughly reviewed the plotting code and replaced all remaining cases.

[philippjfr]

I think the only way we'll catch any more cases will be if we merge and include the change in the RC release.