Close hibernate validator vulnerability

[melowe]

Sanitise potential nested el expressions in configuration path values. Remove dollar signs from path values before creating validation message,

[codecov-io]

Codecov Report

Merging #1007 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1007      +/-   ##
============================================
+ Coverage     99.31%   99.31%   +<.01%     
  Complexity     2231     2231              
============================================
  Files           337      337              
  Lines          6100     6103       +3     
  Branches        363      363              
============================================
+ Hits           6058     6061       +3     
  Misses            5        5              
  Partials         37       37

Impacted Files	Coverage Δ	Complexity Δ
...orum/tessera/config/constraints/PathValidator.java	100% <100%> (ø)	10 <0> (ø)	⬇️

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