Fix bug where dbt_executable_path was not passed to operators

[jlaneve]

Description

This PR fixes a bug with Cosmos, where previously the dbt_executable_path didn't get passed all the way down to the underlying operators. This meant that the operators didn't have an executable, and would result in an error like so:

[2023-07-26, 22:21:06 UTC] {subprocess.py:70} INFO - Running command: [None, 'seed', '--models', 'raw_customers', '--profiles-dir', '/tmp/tmpde8e9703', '--profile', 'airflow_db', '--target', 'dev']
[2023-07-26, 22:21:06 UTC] {taskinstance.py:1824} ERROR - Task failed with exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/cosmos/operators/local.py", line 242, in execute
    result = self.build_and_run_cmd(context=context, cmd_flags=cmd_flags)
  File "/usr/local/lib/python3.10/site-packages/cosmos/operators/local.py", line 188, in build_and_run_cmd
    return self.run_command(cmd=dbt_cmd, env=env, context=context)
  File "/usr/local/lib/python3.10/site-packages/cosmos/operators/local.py", line 172, in run_command
    result = self.run_subprocess(
  File "/usr/local/lib/python3.10/site-packages/cosmos/operators/local.py", line 125, in run_subprocess
    subprocess_result: FullOutputSubprocessResult = self.subprocess_hook.run_command(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/cosmos/hooks/subprocess.py", line 72, in run_command
    self.sub_process = Popen(
  File "/usr/local/lib/python3.10/subprocess.py", line 971, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/local/lib/python3.10/subprocess.py", line 1738, in _execute_child
    and os.path.dirname(executable)
  File "/usr/local/lib/python3.10/posixpath.py", line 152, in dirname
    p = os.fspath(p)
TypeError: expected str, bytes or os.PathLike object, not NoneType

Related Issue(s)

Breaking Change?

Nope!

Checklist

• I have made corresponding changes to the documentation (if required)
• I have added tests that prove my fix is effective or that my feature works

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% 🎉

Comparison is base (554f250) 91.21% compared to head (7243910) 91.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #397      +/-   ##
==========================================
+ Coverage   91.21%   91.28%   +0.06%     
==========================================
  Files          48       48              
  Lines        1684     1686       +2     
==========================================
+ Hits         1536     1539       +3     
+ Misses        148      147       -1     

Files Changed	Coverage Δ
cosmos/converter.py	97.14% <100.00%> (+0.08%)	⬆️

... and 1 file with indirect coverage changes

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