[FIX] website: fix semantics of MockRequest
[FIX] website: fix semantics of MockRequest

We should push the request object on the request stack only in the
__enter__ method, in order to be symmetrical with the __exit__ method.

closes odoo/odoo#53611

X-original-commit: 30e94d305f9cffa816ddc213e0b9329c0263c145
Signed-off-by: Nicolas Lempereur (nle) <2907e499a003d1c3ab7944c0a40c6df46e3e3c2f@odoo.com>
Signed-off-by: Paul Morelle <4950c5a1ead41dfa3dcc3f68ece6c9007ac6ccce@users.noreply.github.com>

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