fix(scm): Always get raw content from scm resolver

[benoitf]

What does this PR do?

Axios is returning a JSON object even if we specify a raw content
axios/axios#907
Need to workaround with a custom transformResponse

Also, provide a better error message to isolate the root cause

What issues does this PR fix or reference?

Fixes eclipse-che/che#20271

Release Notes

Docs PR

[che-bot]

❌ E2E dashboard tests failed ❗

See Details

• Jenkins job

• test report

• logs and configs

• Che dashboard image:quay.io/crw_pr/che-dashboard:321

• Che server image: quay.io/crw_pr/che-server:321

Test product:

• tested with Eclipse Che on K8S (minikube v1.1.1)
• E2E test scenario
• E2E test pipeline source code

• Use comment "[dashboard-ci-test]" to rerun the dashboard e2e tests

Eclipse Che QE channel: https://mattermost.eclipse.org/eclipse/channels/eclipse-che-qe

[github-actions]

Docker image build succeeded: docker.io/maxura/che-dashboard:che-dashboard-pull-321

[codecov]

Codecov Report

Merging #321 (4a82107) into main (e9bac8a) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #321      +/-   ##
==========================================
- Coverage   52.01%   51.99%   -0.03%     
==========================================
  Files         148      148              
  Lines        5646     5649       +3     
  Branches      927      927              
==========================================
  Hits         2937     2937              
- Misses       2432     2435       +3     
  Partials      277      277              

Impacted Files	Coverage Δ
...rc/services/workspace-client/devWorkspaceClient.ts	15.02% <0.00%> (-0.27%)	⬇️
...hboard-frontend/src/store/FactoryResolver/index.ts	18.75% <0.00%> (ø)

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[sleshchenko]

LGTM

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, benoitf, sleshchenko

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