Fix panic during optimize report

[linkous8]

Description

Fixes error reported by Pavel

fsoc optimize report                                                                                                                     ✔
   ⨯ Execution of report query encountered errors. Returned data may not be complete!
   ⨯ Execution Timeout: Execution timeout! No next data received in interval: PT1M (logged with TraceId: [cfdbf4f98d794132b420e0523ddf950f])
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x28 pc=0x1049540b8]

goroutine 1 [running]:
github.com/cisco-open/fsoc/cmd/optimize.extractReportData(0x14000717000)
	github.com/cisco-open/fsoc/cmd/optimize/report.go:214 +0x2a8
github.com/cisco-open/fsoc/cmd/optimize.listReports(0x10525da40, {0x1052d7c00?, 0x0?, 0x0?})
	github.com/cisco-open/fsoc/cmd/optimize/report.go:138 +0x524
github.com/spf13/cobra.(*Command).execute(0x10525da40, {0x140000302c0, 0x0, 0x0})
	github.com/spf13/cobra@v1.8.0/command.go:983 +0x840
github.com/spf13/cobra.(*Command).ExecuteC(0x105259b00)
	github.com/spf13/cobra@v1.8.0/command.go:1115 +0x344
github.com/spf13/cobra.(*Command).Execute(...)
	github.com/spf13/cobra@v1.8.0/command.go:1039
github.com/spf13/cobra.(*Command).ExecuteContext(...)
	github.com/spf13/cobra@v1.8.0/command.go:1032
github.com/cisco-open/fsoc/cmd.Execute(...)
	github.com/cisco-open/fsoc/cmd/root.go:98
main.realMain()
	github.com/cisco-open/fsoc/main.go:36 +0x100
main.main()
	github.com/cisco-open/fsoc/main.go:28 +0x1c 

• moved test data string to separate files
• refactor report command to use flags struct for ease of unit testing
• added unit test with data that was causing a panic in fsoc
• fixed panic in report command where the events uql.DataSet wasn't checked for nil

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.58824% with 59 lines in your changes are missing coverage. Please review.

Project coverage is 15.64%. Comparing base (00d0c6f) to head (0c3529f).
Report is 51 commits behind head on main.

Files	Patch %	Lines
cmd/optimize/report.go	30.95%	51 Missing and 7 partials ⚠️
cmd/optimize/optimize.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #358       +/-   ##
===========================================
- Coverage   26.88%   15.64%   -11.25%     
===========================================
  Files          44      142       +98     
  Lines        4564    11392     +6828     
===========================================
+ Hits         1227     1782      +555     
- Misses       3242     9468     +6226     
- Partials       95      142       +47     

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