subcoordinate_y: reverse the renderers by default

[maximlt]

Addresses #6027

By reverting the orders of the subcoordinate-y glyph renderers.

import numpy as np
import holoviews as hv; hv.extension('bokeh')
from scipy.stats import gaussian_kde

categories = ['A', 'B', 'C', 'D', 'E']
data = {cat: np.random.normal(loc=i-2, scale=1.0, size=100) for i, cat in enumerate(categories)}
x = np.linspace(-5, 5, 100)

areas = []
for i, (cat, values) in enumerate(data.items()):
    pdf = gaussian_kde(values)(x)
        
    area = hv.Area((x, pdf), label=cat).opts(
        subcoordinate_y=True, 
        subcoordinate_scale=1.5,
    )
    areas.append(area)

ridge_plot_areas = (hv.VSpan(-4, -3) * hv.Overlay(areas) * hv.VSpan(3, 4)).opts(
    width=900,
    height=400,
)

ridge_plot_areas.opts(show_legend=False)

• The blue VSpan is rendered first, that's the regular behavior as it's the first element in the overlay
• The subcoord-y plots are rendered in the reversed order
• The red VSpan is rendered last, that's the regular behavior

[philippjfr]

Looks great, thanks!

[github-actions]

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