[FIX] website: fix website menu lazy loading on hover
[FIX] website: fix website menu lazy loading on hover

Small bug introduced by [1]: now the website menu is loaded on demand
to avoid useless page loading. This was done when hovering the toggle
which induced two problems: not loaded if the user was already over the
button when the JS is fully loaded and not loaded if the dropdown was
opened via the keyboard.

Also, the 'mouseover' event was used instead of the 'mouseenter' and the
RPC was not checked for already pending ones. Both issues could lead to
have the RPC performed multiple times for no reason.

[1]: https://github.com/odoo/odoo/commit/4206c1f225f5b1c54a0cdd4913e1d8224a2e7889

closes odoo/odoo#49986

X-original-commit: 7aebd7d88d1d0a0f81351b8a0e12a03964c8431a
Signed-off-by: Quentin Smetz (qsm) <75b324bb495ac8d4f83496f7c52eda774af7ed7a@odoo.com>

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