Add the parameter: metastore.drop-partition-ignore-nonexistent to ignore exceptions when a Hive partition does not exist.

[GangYang-HX]

Fixed a bug that caused the Partition Expire operation to fail due to a non-existent Hive partition.

[JingsongLi]

A few comments on this PR:

1. .gitignore change: The .cursor-svg-check/ entry looks unrelated to this PR — likely IDE-specific. Please remove it or put it into a separate commit.

2. Design question: When MetaException is caught with ignorePartitionNonexistent=true, the code calls partitionExistsInHms() which issues a second HMS RPC (getPartition). If HMS is unhealthy (which is likely the cause of the original MetaException), this verification call may also fail — and the fallback in that case conservatively returns true, causing the original exception to be rethrown anyway. This is a reasonable safety choice, but it means the option won't help when HMS is in a bad state.

   Consider documenting this behavior (i.e., "the option only helps when the specific partition is genuinely absent, not when HMS is having connectivity issues").

3. Title format: The PR title doesn't follow the project convention of [module] description. Should be something like: [hive] Add metastore.drop-partition-ignore-nonexistent option.

4. Option naming: The Paimon project typically uses shorter, more consistent option names. metastore.drop-partition-ignore-nonexistent is quite long. Have you considered metastore.drop-partition.ignore-not-exists to be more consistent with other Paimon options?