fix: DH-19036: Fix failing subplot creation

[jnumainville]

Originally failing was the following:

import deephaven.plot.express as dx
tips = dx.data.tips() # import a ticking version of the Tips dataset

# create 4 plots from within make_subplots
tipping_plots = dx.make_subplots(
    dx.scatter(tips, x="TotalBill", y="Tip", by="Sex",
        title="Tip amount by total bill"),
     dx.scatter(tips, x="TotalBill", y="Tip", by="Sex",
        title="Tip amount by total bill"),
    rows=2, cols=1, shared_xaxes=True, shared_yaxes=False
)

Added docs for shared axes as well

[github-actions]

plotly-express docs preview (Available for 14 days)

[jnumainville]

@margaretkennedy can I get a docs review?

[github-actions]

plotly-express docs preview (Available for 14 days)