Delete copy ctor and copy-assignment for log::Batch

[mbeards]

🦟 Bug fix

Summary

Fixes rule-of-five violation and reduces flakiness of playback tests.

Checklist

• [ ] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[mbeards]

do you mind to sign the commit ?

Looks like the error is on the previous commit https://github.com/gazebosim/gz-transport/pull/501/commits/f043ddb910105fcc661950fec5a5afebe85a1225 already on main?

[azeey]

It looks like the "Validate package.xml" Action fails because the base branch of this PR was changed and that workflow hasn't been forward ported to main. I'll go ahead and merge.