Fix asoctl when importing resources with fixed names

[theunrepentantgeek]

What this PR does / why we need it:

If a resource being imported has a fixed name, it doesn't have an AzureName property and asoctl was encountering a panic.

Fixes #3098

How does this PR make you feel:

[codecov-commenter]

Codecov Report

Merging #3099 (aa8b602) into main (49990e3) will increase coverage by 0.06%.
The diff coverage is 29.31%.

@@            Coverage Diff             @@
##             main    #3099      +/-   ##
==========================================
+ Coverage   54.16%   54.23%   +0.06%     
==========================================
  Files        1400     1400              
  Lines      601166   601178      +12     
==========================================
+ Hits       325622   326030     +408     
+ Misses     222144   221742     -402     
- Partials    53400    53406       +6     

Impacted Files	Coverage Δ
...octl/internal/importing/importable_arm_resource.go	2.66% <0.00%> (-0.06%)	⬇️
...ctl/internal/importing/resource_importer_report.go	0.00% <0.00%> (ø)
...ator/internal/config/object_model_configuration.go	71.36% <0.00%> (-0.07%)	⬇️
...ator/internal/config/supported_resources_report.go	16.66% <ø> (ø)
...ernal/codegen/pipeline/report_resource_versions.go	51.65% <28.57%> (-0.72%)	⬇️
...peline/apply_defaulter_and_validator_interfaces.go	25.00% <69.23%> (+2.07%)	⬆️
...nerator/internal/interfaces/defaulter_interface.go	77.77% <75.00%> (ø)

... and 33 files with indirect coverage changes