Add Vulnerability scanning report to the summaryDetails section

[agarcia-oss]

As discussed in #1601, the json output format is missing the scan image results for a --scan-images execution.

This PR includes a new vulnerabilities section in the report's summaryDetails. The vulnerabilities data follows the same format already defined by the convertToImageScanSummary function in prettyprinter

Since the summaryDetail struct needs to be modified, a follow-up PR will be sent with the changes in the opa-utils repository.

The resulting summary should look like this

"summaryDetails": {
      "controls": {
	}
       "status": "failed",
       "frameworks": [
        ],
	"resourcesSeverityCounters"
	"controlsSeverityCounters"
	"ResourceCounters"
	"vulnerabilities": {
           "mapsSeverityToSummary": {
              "Critical": {
              "numberOfCVEs": 15,
              "numberOfFixableCVEs": 6
           },
          "High": {
              "numberOfCVEs": 128,
              "numberOfFixableCVEs": 48
           },
           "Low": {
              "numberOfCVEs": 18,
              "numberOfFixableCVEs": 8
            },
            "Medium": {
               "numberOfCVEs": 156,
               "numberOfFixableCVEs": 77
            },
           "Negligible": {
               "numberOfCVEs": 159,
               "numberOfFixableCVEs": 1
           },
           "Unknown": {
               "numberOfCVEs": 7,
               "numberOfFixableCVEs": 3
            }
         },
         "CVEs": {},
         "packageScores": {},
         "images": {},
}

[dwertent]

@agarcia-oss Thank you for your contribution!
Please bump the opa-utils version and run go mod tidy (you would need to bump in the base directory and in the httphandler directory)

[agarcia-oss]

@agarcia-oss Thank you for your contribution! Please bump the opa-utils version and run go mod tidy (you would need to bump in the base directory and in the httphandler directory)

Opa-utils dependencies updated!

[dwertent]

Well done :)