chore: bump lerna to 7.0.2, add @lerna/legacy-package-management

[pichlermarc]

Which problem is this PR solving?

Currently, builds are failing as lerna@6.6.2 depends on rimraf@4.4.1 but @lerna/legacy-package-management@7.0.2 used by it does not, which causes an older version rimraf@3.0.2 to be used.

The next version, @lerna/legacy-package-management@7.0.2 fixes this, but was published with lerna@7.0.2, which does not install the former package automatically to support lerna bootstrap, therefore @lerna/legacy-package-management@7.0.2 it needs to be added as a devDependency.

Fixes #3894
Fixes #3925
Supersedes #3881

Short description of the changes

This PR bumps all lerna dependencies to 7.0.2 and adds @lerna/legacy-package-management@7.0.2 as a devDependency in the top-level package.json

Type of change

• Bug fix
• Internal

How Has This Been Tested?

• ran npm install locally and verified that rimraf is at the correct version
• Verified that lerna scripts are still working

[codecov]

Codecov Report

Merging #3926 (2d2ed37) into main (5bee444) will not change coverage.
The diff coverage is n/a.

❗ Current head 2d2ed37 differs from pull request most recent head c881e37. Consider uploading reports for the commit c881e37 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3926   +/-   ##
=======================================
  Coverage   92.89%   92.89%           
=======================================
  Files         297      297           
  Lines        8836     8836           
  Branches     1814     1814           
=======================================
  Hits         8208     8208           
  Misses        628      628           

see 2 files with indirect coverage changes

[legendecas]

NB: It's @lerna/legacy-package-management v6.6.2 that didn't declare rimraf as it's dependency.

Thank you for figuring this out! I'm going to merge this to unblock other PRs.