Improve bug reporting UI/UX

[mingaila]

• [x] Special symbols shouldn't be accepted after the @ (e.g. user@example#com user@exa$mple.com user@ex#ample.com)

• [x] Email addresses without . are accepted now (e.g. test@examplecom)

• [x] The "Report issue" tooltip remains visible when the window is opened.

• [ ] When I close the chat after the bug report (while the bot is thinking) and it replies back the window is opened but the view is not fully visible

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By @lusine-h -> https://github.com/mysteriumnetwork/dvpn-web/issues/513#issuecomment-1786954957

[ZygintasBudrys]

Severity: Major Priority: High

[mingaila]

Tag for testing: 2.17.0-rc1

[lusine-h]

Tooltip issue still exists

[lusine-h]

the following email address is acceptable "test@example-.com"

[lusine-h]