Fix inconsistent pagination styles

What does this MR do?

Fixes the inconsistent pagination styling found in table_pagination.vue - which affects the environments table, pipelines table and registry table.

Loaded without user interaction

Before	After	Issues list pagination (using this as baseline)

Mouse hover over pagination item 1

Before	After	Issues list pagination (using this as baseline)

Keyboard focus over pagination item 1

Before	After	Issues list pagination (using this as baseline)

Mouse hover over pagination item 2

Before	After	Issues list pagination (using this as baseline)

Keyboard focus over pagination item 2

Before	After	Issues list pagination (using this as baseline)

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58194

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer