#821: make ide prefix editable in ide shell to allow non-ide commands

[Ali-Shariati-Najafabadi]

This PR fixes #821

Implemented changes:

• Made the ide prefix in ide shell part of the editable input line instead of a static, non-editable prompt segment, so it can be removed via backspace when entering non-IDEasy commands (e.g. cd)
• Added ShellCommandlet.normalizeLine(String) to strip a leading ide from the input line so behavior for IDEasy commands (e.g. ide status) stays unchanged
• Added ShellCommandletTest covering the new prefix-normalization behavior

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Testing instructions

1. Build the CLI and start ide shell
2. Observe the prompt now shows only $ and the input line is pre-filled with ide which is editable
3. Keep the prefix and type an IDEasy command, e.g. status (full line ide status) -> behaves the same as before (equivalent to typing status alone)
4. Press backspace to remove ide and run a non-IDEasy command, e.g. cd ..-> works correctly without the misleading ide prefix
5. Run mvn -Dtest=ShellCommandletTest test in the cli folder -> all tests pass

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Checklist for this PR

• When running mvn clean test locally all tests pass and build is successful (except pre-existing unrelated failures, see testing instructions note)
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled with internal
• You have formulated clear instructions on how to test your contribution under "Testing instructions"

[coveralls]

Coverage Report for CI Build 31150808432

Coverage increased (+0.06%) to 72.925%

Details

• Coverage increased (+0.06%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 46 coverage regressions across 1 file.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

46 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
com/devonfw/tools/ide/commandlet/ShellCommandlet.java	46	9.25%

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Coverage Stats

Relevant Lines:	17499
Covered Lines:	13306
Line Coverage:	76.04%
Relevant Branches:	7731
Covered Branches:	5093
Branch Coverage:	65.88%
Branches in Coverage %:	Yes
Coverage Strength:	3.23 hits per line

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💛 - Coveralls

[samuelkos17]

Once again great work! I've ran through your testing instructions and everything works perfectly so I'll move this to In Review 😄