RFR: 8367796: Rename AtomicAccess gtests

[Albert Mingkun Yang]

On Wed, 17 Sep 2025 05:48:08 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial renaming change. AtomicAccess gtest names and
> supporting classes are being renamed to use "AtomicAccess" nomenclature,
> rather than just "Atomic". (The potential for ODR violations could have been
> eliminated by instead using anonymous namespaces, but use of those is still
> not permitted in HotSpot.)
> 
> Testing: mach5 tier1

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27330#pullrequestreview-3233329825