[improve][txn] change delete pending ack position from foreach to firstKey

[congbobo184]

Motivation

now transaction pending ack delete pending ack state position use cursor mark delete position.

now the logic is use foreach, every position in pending ack state need to check the position whether smaller than mark delete position. If the position is smaller than mark delete position, it can be deleted from the pending ack state map.

this map is a skipListMap, the key is the position, so we only need to check if the first entry is better, if it is smaller than mark delete we can continue check, otherwise, we only break the check directly.

Modifications

chan foreach to use firstkey

Verifying this change

add the test for it

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

• Does this pull request introduce a new feature? (yes)

• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

• If a feature is not applicable for documentation, explain why?

• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

• doc-not-needed