[REF] web_editor: review overlay/option toggling

Previously, when trying to enable a snippet overlay & options, the
'toggleFocus' method was called. Now the logic is separated for overlay
and options toggling so that we stop calling onFocus/onBlur method of
parent options when only a child snippet is being enabled.

For example, for a section with two columns inside, we had this behavior
before this commit:

1) Click on first column
2) -> the section's onFocus is called
3) -> the first column's onFocus is called
4) Click on second column
5) -> the section's onBlur is called
6) -> the first column's onBlur is called
7) -> the section's onFocus iscalled
8) -> the second column's onFocus is called
9) Click on another snippet
10) -> the section's onBlur is called
11) -> the second column's onBlur is called

Now, steps 5 and 7 are gone.

Related to https://github.com/odoo/odoo/pull/38997
Related to task-2090180

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