MOBT-661: Required changes for precipitation phase accumulations

[brhooper]

Related to: https://github.com/metoppv/mo-blue-team/issues/661, https://github.com/metoppv/mo-blue-team/issues/671
Acceptance test data: metoppv/improver_test_data#48

Description
This PR includes a few changes which are required for the work to produce precipitation phase accumulations over longer periods.

Included changes are as follows:

• Add option for 'realization' tie-breaking within ECC. This resolves ties within the dependence template by assigning values to the highest realization number.
• Factor out code which enables recycling realizations in the ECC dependence template.
• Create a CLI for the above recycling code to enable extending the realization dimension on phase probability cubes. This ensures realization recycling is done using a consistent method, which is important for precipitation phase accumulation diagnostics for reasons laid out in this comment (https://github.com/MetOffice/improver_aux/pull/420#issuecomment-2051865950).
• Make one of the checks in the combine plugin easier to pass - test will no longer fail if coordinates on input cubes differ in the var_name, except if the difference is on a threshold coordinate. This mirrors, and was necessitated by, the functionality of the MergeCubes plugin, which removes this attribute from coordinates.
• Add functionality to 'recursive_filter' plugin to allow application to cubes containing different masks on each spatial slice. Also adds this functionality to the corresponding CLI.
• Add unit and acceptance tests where required for each of the above.

Testing:

• Ran tests and they passed OK
• Added new tests for the new feature(s)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.37%. Comparing base (84a8944) to head (f7aff40).
Report is 31 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1997      +/-   ##
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- Coverage   98.39%   98.37%   -0.03%     
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  Files         124      133       +9     
  Lines       12212    12903     +691     
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+ Hits        12016    12693     +677     
- Misses        196      210      +14     

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[github-actions]

In order to maintain a backlog of relevant PRs, we automatically label them as stale after 60 days of inactivity.

If this PR is still important to you, then please comment on this PR and the stale label will be removed.

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[brhooper]

Commenting to remove 'staleness'.

[gavinevans]

Thanks @brhooper 👍

I've added some comments and suggestions.

[gavinevans]

Thanks @brhooper 👍

I've happy to approve these changes, subject to the GitHub Actions failures being addressed.

[brhooper]

Thanks @brhooper 👍

I've happy to approve these changes, subject to the GitHub Actions failures being addressed.

I've pulled the changes from this PR into my PR. The GIthub actions now succeed as expected following this fix.