Bugfix for cascading updates on interviews and candidate's interviews

[sueann-chua]

Changes to execute method:

• check if positions field has been edited
• if edited, check if positions of the interviews scheduled for the candidate matches with the updated positions applied.
• delete candidate from all interviews with positions that they no longer apply to.
• update candidate details to all the interviews with positions they still apply to.
• if not edited, just update the candidate in the existing interviews scheduled for them.

[codecov-commenter]

Codecov Report

Merging #268 (db80824) into master (4ab6758) will decrease coverage by 0.10%.
The diff coverage is 30.76%.

@@             Coverage Diff              @@
##             master     #268      +/-   ##
============================================
- Coverage     78.20%   78.10%   -0.11%     
- Complexity      990      991       +1     
============================================
  Files           119      119              
  Lines          3019     3028       +9     
  Branches        412      415       +3     
============================================
+ Hits           2361     2365       +4     
- Misses          535      539       +4     
- Partials        123      124       +1     

Impacted Files	Coverage Δ
.../address/logic/candidate/EditCandidateCommand.java	86.95% <30.76%> (-3.61%)	⬇️

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[angnobel]

LGTM