Panic error when versioning not enabled on Azure blob storage.

[dheeth]

Checklist:

• [x] I've searched in the docs and FAQ for my answer
• [x] I've included steps to reproduce the bug.

Describe the bug

When installating Devtron with Azure Blob Storage, ci-runner fails to download cache when versioning isn't enabled. The error logs are misleading and shows null pointer reference in memory. ci-runner fails with panic error and doesn't recover itself

To Reproduce

1. Install Devtron with Azure Blob storage
2. Do not enable versioning on the blobs
3. Run ci for 2-3 times

Expected behavior

If not able to download cache, it should print the specific message and continue with the build

Current behavior

It fails with a panic error

AB#440