fix: address tar CVE by removing electron samples from workspaces and overriding tar to ^7.5.3

- Remove ElectronSystemBrowserTestApp from msal-node-samples workspace glob (explicit list)
- Remove extensions/samples/* wildcard (electron-webpack also used @electron-forge)
- Add overrides.tar = ^7.5.3 to fix remaining tar@6.2.1 via @angular/cli 19 -> pacote chain
  (Angular CLI 19.x will not receive an official fix per angular/angular-cli#32324)
- Regenerate package-lock.json: tar now resolves to 7.5.13

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: hectormmg