deprecate tape.is_sampled and tape.all_sampled

[timmysilv]

Context:
tape.is_sampled and tape.all_sampled are not very useful and could really be evaluated on a per-call basis. Plus, maintaining the correctness of these values can be difficult if new measurements are introduced.

Description of the Change:
Raise a warning whenever those properties are accessed.

Benefits:
We're getting rid of stuff that may not necessarily belong on the tape API! 🧹

Possible Drawbacks:
In the deprecation notice, we're suggesting the 4 measurement types that are currently being used, but they are theoretically subject to change. We discussed other things to recommend, but I think this is the best option so far because it's the same as what we use in QubitDevice.execute. Sure, it might change one day. But by then, the properties (and their warnings) will be removed altogether!

[sc-45870]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8aee680) 99.64% compared to head (af33e18) 99.64%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4773      +/-   ##
==========================================
- Coverage   99.64%   99.64%   -0.01%     
==========================================
  Files         381      381              
  Lines       34308    34042     -266     
==========================================
- Hits        34187    33920     -267     
- Misses        121      122       +1     

Files	Coverage Δ
pennylane/_device.py	99.41% <ø> (-0.01%)	⬇️
pennylane/_qubit_device.py	99.44% <100.00%> (ø)
pennylane/interfaces/jax.py	98.93% <100.00%> (-0.08%)	⬇️
pennylane/interfaces/jax_jit.py	100.00% <100.00%> (ø)
pennylane/tape/qscript.py	100.00% <100.00%> (ø)
pennylane/tape/tape.py	98.49% <ø> (-0.06%)	⬇️

... and 38 files with indirect coverage changes

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[albi3ro]

👍 Just a comment about the moved block on the deprecations page, but looks good to me :)

[lillian542]

🚀