[BUG] `colorbar_ticks=false`/`:none`/`nothing` not working

[Socob]

Details

In pyplot, colorbar_ticks=false disables the colorbar ticks and tick labels, similar to ticks=false, ticks=:none, or ticks=nothing. However, for all other backends (including pythonplot), it seems that this is not working (although for some backends, colorbar_ticks just doesn’t work in general, see #4658). It would be good to have this working consistently.

Backends

This bug occurs on

Backend	yes	no	untested
gr (default)	X
pythonplot	X
plotlyjs	X
pgfplotsx	X
unicodeplots	X
inspectdr			N/A
gaston	X

Versions

• Plots.jl version: v1.38.5
• Backend version (]st -m <backend(s)>):
  • GR v0.71.6
  • PythonPlot v1.0.0
  • PlotlyJS v0.18.10
  • PGFPlotsX v1.5.3
  • UnicodePlots v3.4.0
  • Gaston v1.1.0
• Output of versioninfo():

  Julia Version 1.8.5
  Commit 17cfb8e65ea (2023-01-08 06:45 UTC)
  Platform Info:
    OS: Linux (x86_64-linux-gnu)
    CPU: 16 × AMD Ryzen 7 4800H with Radeon Graphics
    WORD_SIZE: 64
    LIBM: libopenlibm
    LLVM: libLLVM-13.0.1 (ORCJIT, znver2)
    Threads: 1 on 16 virtual cores

[ivan-boikov]

@BeastyBlacksmith could you please remove GR and PGFPlotsX labels (due to #4704)?