Remove deprecated Flatten and Tile Ops

[hectormz]

This PR closes #399 and removes long deprecated Flatten and Tile Ops.

I'm not sure if unittest.rst is maintained, but I made a change to the code there.

My dev environment is not quite right, so I couldn't confirm if the debug output in debug_faq.rst (line 158) needed to be updated.

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[codecov]

Codecov Report

Merging #948 (7ff73e6) into main (2fee841) will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #948      +/-   ##
==========================================
+ Coverage   79.10%   79.20%   +0.10%     
==========================================
  Files         152      152              
  Lines       48061    47937     -124     
  Branches    10934    10916      -18     
==========================================
- Hits        38017    37967      -50     
+ Misses       7534     7464      -70     
+ Partials     2510     2506       -4     

Impacted Files	Coverage Δ
aesara/tensor/basic.py	90.65% <ø> (+2.85%)	⬆️
aesara/tensor/basic_opt.py	85.93% <ø> (+0.83%)	⬆️

[ricardoV94]

Looks good to me. Need to fix a merge conflict

[hectormz]

@ricardoV94 Thanks for the review! I merged in changes that @brandonwillard made after my PR

[ricardoV94]

I think you will have to rebase from main instead of merging. Can you confirm @brandonwillard?

[hectormz]

I can do that as well and re-push

[hectormz]

Are you able to restart the checks? Seemed to cancel with force push, but not restart

[ricardoV94]

Are you able to restart the checks? Seemed to cancel with force push, but not restart

I rebased on main again, tests should rerun now

[brandonwillard]

Looks good; much appreciated!