More detailed info in ContentNotFound exception #10089

[rymsha]

• When image is not found warning is logged, but it is not possible to identify in which repository it was looked up
• When attachment (full image, for instance) is not found no warning message is logged.
• Frontend receives a bit too much info in the error url

This is all fixed by generating log-ref for the frontend, possible to find in logs. ContentNotFound contains much more information that helps to identify the repository.

Additionally many log statements were reviewed for correct logging of stacktraces

[codecov]

Codecov Report

Patch coverage: 71.20% and project coverage change: -0.04 ⚠️

Comparison is base (1ba1184) 84.20% compared to head (f07dde7) 84.17%.

❗ Current head f07dde7 differs from pull request most recent head 4f058f8. Consider uploading reports for the commit 4f058f8 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #10098      +/-   ##
============================================
- Coverage     84.20%   84.17%   -0.04%     
+ Complexity    19328    19324       -4     
============================================
  Files          2585     2585              
  Lines         67575    67651      +76     
  Branches       5396     5396              
============================================
+ Hits          56901    56942      +41     
- Misses         8036     8071      +35     
  Partials       2638     2638              

Impacted Files	Coverage Δ
...om/enonic/xp/app/ApplicationNotFoundException.java	0.00% <0.00%> (ø)
...in/java/com/enonic/xp/exception/BaseException.java	77.77% <ø> (ø)
...m/enonic/xp/exception/InitializationException.java	0.00% <0.00%> (ø)
...ava/com/enonic/xp/exception/NotFoundException.java	50.00% <ø> (ø)
.../java/com/enonic/xp/exception/SystemException.java	100.00% <ø> (ø)
.../src/main/java/com/enonic/xp/init/Initializer.java	85.71% <0.00%> (ø)
...nonic/xp/security/IdProviderNotFoundException.java	0.00% <0.00%> (ø)
...onic/xp/security/auth/AuthenticationException.java	25.00% <ø> (ø)
.../src/main/java/com/enonic/xp/xml/XmlException.java	30.00% <ø> (ø)
...n/java/com/enonic/xp/xml/parser/XmlFormMapper.java	93.04% <0.00%> (ø)
... and 32 more

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