Fixes clipboard_button copy tooltip overlapping

What does this MR do?

Fixes the bug as reported in #216001 (closed). Specifically it:

1. Adds v-gl-tooltip.hover.blur to the gl-deprecated-button inside the clipboard_button.vue component. This ensures the tooltip here disappears after the copy action is invoked.
2. Triggers displaying of the Copied tooltip after the trigger is blurred. This ensures the Copied tooltip shows first time.

Screenshots

Package button	Merge request button	Project commit button

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team