8335645: j.u.Formatter#trailingZeros improved with String repeat

[wenshao]

In JDK 21, StringBuilder added a repeat method, which can be used to improve j.u.Formatter#trailingZeros

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Progress

• [x] Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue

Issue

• JDK-8335645: j.u.Formatter#trailingZeros improved with String repeat (Enhancement - P4)

Reviewers

• Chen Liang (@liach - Committer)
• Justin Lu (@justin-curtis-lu - Committer)
• Naoto Sato (@naotoj - Reviewer)

Reviewing

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