Improvements to top container indicator column sort

[Hurlyburly2]

Description

This change improves the sorting of the indicator column when viewing the results of a search for top containers. It especially improves results on mixed alphabetical + numeric indicators, and no longer sorts by string length.

Related JIRA Ticket or GitHub Issue

How Has This Been Tested?

Manual testing, and this passes the indicator sort test that already exists in the "searches containers and performs bulk operations" block.

Screenshots (if appropriate):

old behavior:

new behavior:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the CONTRIBUTING document.
• I have authority to submit this code.
• I have added tests to cover my changes.
• All new and existing tests passed.

[mark-cooper]

LGTM 👍