[ET-VK] 6/n Split dispatches between multiple command buffers. Repurpose submit_current_cmd_and_wait to wait based on input flag.

[trivedivivek]

Stack from ghstack (oldest at bottom):

• #12530
• -> #12529
• #12527
• #12525
• #12523
• #12522
• #12519

This diff makes changes to the submit_current_cmd_and_wait function in the ComputeGraph class to repurpose it to wait for command buffer completion based on an input flag. The function is renamed to submit_current_cmd and now takes an additional wait parameter. If wait is true, the function submits the command buffer to the GPU and waits for its completion. Otherwise, it only submits the command buffer without waiting.

Differential Revision: D78360042

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12529

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:x: 2 New Failures, 2 Unrelated Failures

As of commit c103fd7b8a17402e36025428e5b7520144e60a07 with merge base 4551a56a454bb6160f9e091e115f068e4c3357bc ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh) RuntimeError: Command docker exec -t e12e07f62e1bb06aa1d8ec5b8c0c05bad5c1c4d81bd32b96aac90b142402899f /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh) RuntimeError: Command docker exec -t 8be81e7f5b444ec5c6d5429a8a1e3de3f173195f15c8128f7a90200689441220 /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure) RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure) RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
Feel free to remove the Stale label if you feel this was a mistake.
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