Fix: prevent default installation of JetBrains pre-releases

[priyagupta108]

Description:
This update ensures that JetBrains Runtime pre-release (EA) versions are excluded by default unless explicitly requested. This prevents unintended installation of EA builds when specifying a standard version like 21.

Related issue:
#829

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull Request Overview

This PR updates the JetBrains distributions handling to prevent the default installation of pre-release (EA) versions unless explicitly requested. Key changes include updating the raw version interface to include a prerelease flag and changing the build property type, and modifying the installer logic to filter versions based on the stability setting.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/distributions/jetbrains/models.ts	Added the prerelease flag and changed the build property from a number to a string.
src/distributions/jetbrains/installer.ts	Adjusted version filtering logic to include the new prerelease field and updated build parsing.

Comments suppressed due to low confidence (3)

src/distributions/jetbrains/models.ts:12

• Changing the build property type from number to string may affect consumers of this API. Please verify that all dependent logic now correctly treats build as a string.

build: string;

src/distributions/jetbrains/installer.ts:164

• [nitpick] With the build property now being a string, ensure that all logic relying on the build value (e.g., version comparisons) correctly handles string values instead of numbers.

const build = vsplit[1];

src/distributions/jetbrains/installer.ts:126

• [nitpick] The filtering logic based on the stable flag now directly uses the prerelease field. Ensure this behavior is well-tested so that only the intended versions are selected based on the stability preference.

this.stable ? !version.prerelease : version.prerelease