FINERACT-2502: Resolve the issue 403 Forbidden error when a client is missing a profile image

[ibhoomi16]

Description

This PR resolves the issue where a "403 Forbidden" error alert appears on the UI when a client is missing a profile image.

Jira Ticket: FINERACT-2502

Changes:
Changes:

• Updated DocumentNotFoundException to extend AbstractPlatformResourceNotFoundException so it correctly maps to 404.
• Removed generic exception wrapping in ImageReadPlatformServiceImpl to stop hiding the "Not Found" error.
• Added ImageReadPlatformServiceImplTest to verify that DocumentNotFoundException is thrown for missing images.
  Verification:
• Verified with Postman that missing images now return 404 Not Found (Previously 403 Forbidden).

Checklist

• Write the commit message as per our guidelines
• Acknowledge that we will not review PRs that are not passing the build ("green")
• Create/update unit or integration tests for verifying the changes made.
• Follow our coding conventions.
• Add required Swagger annotation and update API documentation at fineract-provider/src/main/resources/static/legacy-docs/apiLive.htm with details of any API changes
• This PR must not be a "code dump".

[IOhacker]

@ibhoomi16 the Commit message and the PR message must be "FINERACT-2502: Resolve the issue 403 Forbidden error when a client is missing a profile image". Remove any other Jira ticket unrelaed to this one.

Link to Apache Fineract Jira ticket https://issues.apache.org/jira/browse/FINERACT-2502

Make sure that you are including a Test class and please sign your commit.

[IOhacker]

Kindly see my comments

[ibhoomi16]

I have updated the PR as requested.

[IOhacker]

Run './gradlew :fineract-document:spotlessApply' to fix these violations.

[IOhacker]

@ibhoomi16 please make sure that you got a Signed Commit:

All committers already have PGP/GPG keys, so just make sure you're also signing commits. You can add this to your ~/.gitconfig (or equivalent) to do it automatically:

[commit]
gpgSign = true

Upload your public key to github to make the verified badges green.

More info: FINERACT-2177, PR #5431.

Hints: 1) try it locally before pushing. 2) have git run it for you: Create .git/hooks/pre-push with:

#!/bin/sh
scripts/verify-signed-commits.sh --strict

Be sure to make that script executable.