8344541: [lworld] jdk/tools/sincechecker/modules/java_base/CheckSince_javaBase.java finds "@since" version errors

[MrSimms]

Added --ignoreSince <string> option to SinceChecker to allow the project keep using the token "Valhalla" as since version until integration time, at which point, a simple replace @since Valhalla with the appropriate version.

This also requires new API to use the since tag, since the checker still requires it (even if its just a token).

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Progress

• Change must not contain extraneous whitespace

Issue

• JDK-8344541: [lworld] jdk/tools/sincechecker/modules/java_base/CheckSince_javaBase.java finds "@since" version errors (Bug - P4)

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[openjdk]

@MrSimms This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8344541: [lworld] jdk/tools/sincechecker/modules/java_base/CheckSince_javaBase.java finds "@since" version errors

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