Fail AzureKeyVaultHealthCheck if no keys, certificates or secrets configured

[sungam3r]

fixes #785

[codecov-commenter]

Codecov Report

Merging #1949 (8d4301c) into master (8f7d707) will increase coverage by 0.04%.
The diff coverage is 50.00%.

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@@            Coverage Diff             @@
##           master    #1949      +/-   ##
==========================================
+ Coverage   66.34%   66.38%   +0.04%     
==========================================
  Files         250      250              
  Lines        8643     8645       +2     
  Branches      612      613       +1     
==========================================
+ Hits         5734     5739       +5     
+ Misses       2757     2753       -4     
- Partials      152      153       +1     

Flag	Coverage Δ
ArangoDb	26.66% <ø> (ø)
AzureKeyVault	21.65% <50.00%> (+2.12%)	⬆️
Consul	22.72% <ø> (ø)
EventStore	61.87% <ø> (ø)
EventStore.gRPC	25.69% <ø> (ø)
Gremlin	23.23% <ø> (ø)
RabbitMQ	48.10% <ø> (ø)
RavenDb	70.61% <ø> (ø)
Redis	66.82% <ø> (ø)
SignalR	28.28% <ø> (ø)
SqlServer	28.74% <ø> (ø)
System	37.39% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...thChecks.AzureKeyVault/AzureKeyVaultHealthCheck.cs	15.62% <50.00%> (+5.94%)	⬆️

... and 1 file with indirect coverage changes