Fix integration test on main, extract fallback CLI commands, add Azure fallback support and add sync fallback support

[parasj]

Fixes: #553

This PR makes several cleanups:

• Merge UsageClient logic for exceptions and usage
• Extract fallback command generation to another helper file
• Implement fallback commands for sync
• Implement fallback commands for Azure

Integration test rerun pending: https://github.com/skyplane-project/skyplane/actions/runs/3075774286

[ShishirPatil]

Breaks skyplane cp for s3 - s3 transfer

Traceback (most recent call last):
  File "/home/ubuntu/miniconda/bin/skyplane", line 8, in <module>
    sys.exit(app())
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/typer/main.py", line 214, in __call__
    return get_command(self)(*args, **kwargs)
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/click/core.py", line 1126, in __call__
    return self.main(*args, **kwargs)
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/click/core.py", line 1051, in main
    rv = self.invoke(ctx)
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/click/core.py", line 1393, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/click/core.py", line 752, in invoke
    return __callback(*args, **kwargs)
  File "/home/ubuntu/miniconda/lib/python3.8/site-packages/typer/main.py", line 500, in wrapper
    return callback(**use_params)  # type: ignore
  File "/home/ubuntu/skylark/skyplane/cli/cli.py", line 155, in cp
    src_client = ObjectStoreInterface.create(src_region_tag, bucket_src)
  File "/home/ubuntu/skylark/skyplane/obj_store/object_store_interface.py", line 109, in create
    raise ValueError(f"Invalid region_tag {region_tag} - could not create interface")
ValueError: Invalid region_tag s3:infer - could not create interface

[JasonDing0401]

The changes in the performance logging client look good to me!

[ShishirPatil]

As a design choice skyplane/cli/cli_impl/cp_replicate_fallback.py introduces isolation but increases the surface area. Do we want to stick to this long term?

[parasj]

As a design choice skyplane/cli/cli_impl/cp_replicate_fallback.py introduces isolation but increases the surface area. Do we want to stick to this long term?

We should eventually migrate off of this in the future, but I want to isolate this functionality so we can swap implementation as you implement improved on-prem functionality.