feat: use azure-pipelines tool lib

[danlucian]

Introducing azure-pipelines-tool-lib/tool for handling binary installations

This pull request introduces the use of the azure-pipelines-tool-lib/tool library to handle the installation of binaries in the Snyk Azure Pipelines tasks. The key changes include:

• Integration of azure-pipelines-tool-lib/tool: added the downloadToolWithRetries(...) function from the mentioned library to manage the download and retry logic for snyk binaries (cli and snyk-to-html).
• Improved download logic: enhanced the download process with retry capabilities to ensure robustness and reliability.
• Proxy support: automatic detection and use of the HTTP/HTTPS proxy configuration of the agent it's running on.
• Executable permissions: added logic to set executable permissions for downloaded files on Unix-based systems. The files downloaded with the azure lib tool are configured, on Unix systems, just with read and write permissions thus requiring extra logic.

[CLAassistant]

All committers have signed the CLA.

[CatalinSnyk]

Also tested this locally with a proxy and it's looking good ✅

[github-actions]

Your PR has not had any activity for 30 days. In 2 days I'll close it. Make some activity to remove this.

[snyk-io]

🎉 Snyk checks have passed. No issues have been found so far.

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