Give each run its own browser instead of a machine-wide one

[PrestaEdit]

Two PrestaFlow processes running at the same time on one machine closed each other's Chrome.

Root cause

• A run finds its browser through a socket file. Its path was the same for the whole machine: $TMPDIR/prestaflow-.browser. Every process read and wrote it.
• At the end of a run, ExecuteSuite::execute() closed the browser named in that file, then deleted the file.
• Any run that finished, even a suite without a browser, therefore closed the Chrome of a run still in progress.

Symptoms

• The page was closed and is not available anymore, at the first step of GuestCheckout.
• When the close happened between two steps, a fresh Chrome was started and the session lost, so the checkout failed later ("Option France not found").
• It looked version-specific (1.7.8.11 / 9.0.0) only because other runs happened to be going on at the time.

Proof

Checkout on 9.0.0, then psflowdemo's browser-free Smoke started 1.4 s later in another process:

• the Checkout run failed ;
• temporary logs showed the other process closing the browser 2 ms before the exception ;
• right after, Target.getTargets returned nothing.

Fix

• ExecuteSuite scopes the socket and options files to its own run (run-<pid>-<random>), via TestsSuite::scopeBrowserFilesTo().
• At the end, releaseBrowser() closes only that browser and deletes only those files.
• Code that uses TestsSuite without ExecuteSuite keeps the shared path, and with it reconnection to an existing browser.

Verified

• tests/Unit/Command/BrowserOwnershipTest.php, without a browser: 2 of its 4 tests fail without the fix. Full suite: OK (336 tests, 764 assertions).
• On fresh Flashlight shops, with psflowdemo's Checkout and its payment init-script:
  • 1.7.8.11, 8.1.7 and 9.0.0: 4/4 each ;
  • with a second run started in parallel: 4/4 on 1.7.8.11 and three times on 9.0.0, where the same setup failed before the fix.

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