Normalize layers/groups management in TOC #10247

[rowheat02]

Description

fixes: #10247.
Some old maps and exports have groups in legacy format which shows some bugs like those mentioned in #10247.
Old formats can be converted to new standard formats with UI-wise invisible default group as a parent of all groups.

legacyGroups = [
  { id: '1', name: 'Group 1' },
 { id: DEFAULT_GROUP_ID }
 ];

newStandardFormat=[
      {
          id: <DEFAULT_GROUP_ID>,
         name: <DEFAULT_GROUP_ID>,
        nodes: [
             { id: '1', name: 'Group 1' },
             { id: 'DEFAULT_GROUP_ID.<uuid>' } // Unique UUID generated
         ],
        expanded: true
    }
 ]
 

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Issue

What is the current behavior?

#10247
There are some interactivity bugs on TOC in old maps and exports.

What is the new behavior?

There are no interactivity bugs on TOC in old maps and exports.

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

[rowheat02]

@tdipisa

• This PR solves the bugs mentioned here Normalize layers/groups management in TOC  #10247
• Now the conversion is done considering groups from this map.https://dev-mapstore.geosolutionsgroup.com/mapstore/#/viewer/39079. Are there any other maps with TOC bugs to verify?

[tdipisa]

@allyoucanmap it seems @rowheat02 is waiting for your feedback to unblock and finalize this PR. Can you please have a look?