Remove featurePrepareDispatcher with limitedParallelism from AIAgentPipeline

[serge-p7v]

Motivation and Context

There were two bug reports related to incompatibility of kotlinx-coroutines version: #273 and #678 The common cause is the method "Dispatchers.Default.limitedParallelism(5)" with different number of parameters in 1.8 (runtime) and 1.10 versions. The solution is to remove "Dispatchers.Default.limitedParallelism(5)" from AIAgentPipeline. This way we can improve the compatibility with kotlinx-coroutines 1.8 in runtime.
This PR is replacing that one #878

Breaking Changes

none, prepareFeatures method will use an existing CoroutineDispatcher instead of its own.

---

Type of the changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tests improvement
• Refactoring

Checklist

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

Additional steps for pull requests adding a new feature

• An issue describing the proposed change exists
• The pull request includes a link to the issue
• The change was discussed and approved in the issue
• Docs have been added / updated

[github-actions]

Qodana for JVM

17374 new problems were found

Inspection name	Severity	Problems
Unused import directive	🔶 Warning	16213
Check Kotlin and Java source code coverage	🔶 Warning	1148
Missing KDoc for public API declaration	🔶 Warning	11
If-Null return/break/... foldable to '?:'	◽️ Notice	2

@@ Code coverage @@
+ 71% total lines covered
15393 lines analyzed, 10936 lines covered
# Calculated according to the filters of your coverage tool

☁️ View the detailed Qodana report

Contact Qodana team

Contact us at [email protected]

• Or via our issue tracker: https://jb.gg/qodana-issue
• Or share your feedback: https://jb.gg/qodana-discussions

[kpavlov]

Thank you, @serge-p7v 👍🏻

[Ololoshechkin]

Cc @sdubov