Add a convenience method that runs both RB and XEB

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.75%. Comparing base (e76702f) to head (eb9c0ed).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6471 +/- ## ========================================== - Coverage 97.75% 97.75% -0.01% ========================================== Files 1105 1105 Lines 94897 94909 +12 ========================================== + Hits 92771 92782 +11 - Misses 2126 2127 +1 ```

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[pavoljuhas]

gpylint run with the new configuration found following docstring issues.
I think it is worthwhile to fix them so we have a complete info from pydoc or if this gets rendered in web docs, WDYT?

************* File cirq-core/cirq/experiments/two_qubit_xeb.py
cirq-core/cirq/experiments/two_qubit_xeb.py:1:0: missing-module-docstring
cirq-core/cirq/experiments/two_qubit_xeb.py:71:0: g-doc-return-or-yield
cirq-core/cirq/experiments/two_qubit_xeb.py:99:0: g-doc-return-or-yield
cirq-core/cirq/experiments/two_qubit_xeb.py:149:0: g-short-docstring-punctuation
cirq-core/cirq/experiments/two_qubit_xeb.py:149:0: g-doc-return-or-yield
cirq-core/cirq/experiments/two_qubit_xeb.py:242:0: g-doc-return-or-yield
cirq-core/cirq/experiments/two_qubit_xeb.py:271:0: g-doc-args
cirq-core/cirq/experiments/two_qubit_xeb.py:272:0: g-doc-return-or-yield

[NoureldinYosri]

@pavoljuhas I completed the missing docstrings with the help of an LLM :D. ptal

[pavoljuhas]

@pavoljuhas I completed the missing docstrings with the help of an LLM :D. ptal

Looks good! :-o There is one last thing about changing the default value of the random_state argument to None, otherwise LGTM.