base64 encode workid to get work log path to prevent path traversal

[arifogel]

No description provided.

[batfish-bot]

This change is 

[codecov]

Codecov Report

Merging #5718 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #5718   +/-   ##
=========================================
  Coverage     71.37%   71.38%           
- Complexity    33639    33661   +22     
=========================================
  Files          2786     2788    +2     
  Lines        139541   139606   +65     
  Branches      16781    16792   +11     
=========================================
+ Hits          99604    99655   +51     
- Misses        32073    32077    +4     
- Partials       7864     7874   +10     

Impacted Files	Coverage Δ	Complexity Δ
...lient/src/main/java/org/batfish/client/Client.java	52.11% <ø> (+0.34%)	309.00 <0.00> (ø)
...ain/java/org/batfish/storage/FileBasedStorage.java	83.03% <100.00%> (+0.06%)	142.00 <5.00> (+1.00)
...ish/src/main/java/org/batfish/config/Settings.java	84.59% <100.00%> (-0.12%)	93.00 <0.00> (ø)
...a/org/batfish/datamodel/flow/MatchSessionStep.java	78.37% <0.00%> (-6.92%)	2.00% <0.00%> (ø%)
...a/org/batfish/datamodel/flow/SetupSessionStep.java	78.37% <0.00%> (-6.92%)	2.00% <0.00%> (ø%)
.../src/main/java/org/batfish/datamodel/flow/Hop.java	53.33% <0.00%> (-6.67%)	5.00% <0.00%> (-1.00%)
...rc/main/java/org/batfish/datamodel/flow/Trace.java	87.09% <0.00%> (-3.23%)	12.00% <0.00%> (-1.00%)
...col/src/main/java/org/batfish/role/InferRoles.java	89.54% <0.00%> (-1.37%)	50.00% <0.00%> (-1.00%)
...src/main/java/org/batfish/coordinator/PoolMgr.java	64.04% <0.00%> (-1.13%)	15.00% <0.00%> (-1.00%)
..._bigip_imish/F5BigipImishConfigurationBuilder.java	90.55% <0.00%> (-0.97%)	96.00% <0.00%> (+3.00%)	⬇️
... and 13 more

[dhalperi]

Reviewed 1 of 3 files at r1, 3 of 5 files at r2, 2 of 2 files at r3.
Reviewable status: complete! all files reviewed, all discussions resolved