fix: remove lerna legacy options

[david-luna]

Which problem is this PR solving?

After the upgrade of lerna the release-please workflow fails due to legacy configuration that newer version does not accept. The failure message is

npx lerna publish from-package --no-push --no-private --no-git-tag-version --no-verify-access --yes
  shell: /usr/bin/bash -e {0}
  env:
    NPM_CONFIG_USERCONFIG: /home/runner/work/_temp/.npmrc
    NODE_AUTH_TOKEN: ***
    NPM_CONFIG_PROVENANCE: true
lerna notice cli v[8](https://github.com/open-telemetry/opentelemetry-js-contrib/actions/runs/15204321834/job/42764004634#step:10:9).2.2
lerna ERR! ECONFIGWORKSPACES The "useWorkspaces" option has been removed. By default lerna will resolve your packages using your package manager's workspaces configuration. Alternatively, you can manually provide a list of package globs to be used instead via the "packages" option in lerna.json

Also when fixing this issue another message appears about the no-verify-access CLI option.

npx lerna publish from-package --no-push --no-private --no-git-tag-version --no-verify-access --yes
lerna notice cli v8.2.2
lerna info versioning independent
lerna WARN verify-access --verify-access=false and --no-verify-access are no longer needed, because the legacy preemptive access verification is now disabled by default. Requests will fail with appropriate errors when not authorized correctly.

The option is needed since now is the default

Short description of the changes

• remove useWorkspaces from lerna.json
• update lerna publish command options
• remove RELEASING.md as commented in chore: upgrade lerna #2836 (comment)

[pichlermarc]

looks good!
thanks for following up on the broken workflow 🙂

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.69%. Comparing base (9ee8dc7) to head (43e2708).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2854      +/-   ##
==========================================
+ Coverage   89.64%   89.69%   +0.04%     
==========================================
  Files         184      184              
  Lines        9032     9032              
  Branches     1852     1852              
==========================================
+ Hits         8097     8101       +4     
+ Misses        935      931       -4     

see 1 file with indirect coverage changes

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