fix(tooltip): fix wrong initial and focus tooltip positions in followMouse mode

[bmichalowski]

Done

The tooltip did not handle the initial position correctly in followMouse mode.
There was also an issue with listening to mouse move events only when the tooltip was open.

QA

Pinging @canonical/react-library-maintainers for a review.

QA steps

Bug 1: Tooltip is not visible on keyboard focus in followMouse mode

1. Given the tooltip is in followMouse mode
2. And the user has focused the element with the tooltip using the TAB key
3. When the element receives focus
4. Then the tooltip should be visible

Bug 2: Tooltip appears at previous cursor location instead of current

1. Given the tooltip is in followMouse mode
2. And the user hovers over an element on the left side
3. And then moves the cursor away from the element
4. When the user hovers over an element on the right side
5. Then the tooltip should appear next to the current cursor position
6. And not at the previous location

Percy steps

No visual changes expected

[webteam-app]

bmichalowski is not a collaborator of the repo

[bmichalowski]

@canonical/react-library-maintainers please take a look at the proposed changes

[edlerd]

Thank you for the contribution. This is an improved handling of the follow mouse mode indeed!

Some small nitpicks on formatting below, then this LGTM to merge.

[edlerd]

Please stash all your commits with the formatting changes into one for a clean history.

[edlerd]

Also, please rebase on the main branch to pull in recent updates.

[bartaz]

@bmichalowski Are you interested in continuing working on the issue?

[bmichalowski]

@bartaz Yes, I'd be happy to finish it. However, I need a helping hand with Percey. Visually, nothing changes, so I think it should be marked as non-required. However, it starts and crashes during execution.