[MMI] fix property name and filter out custodian

[zone-live]

We were looking for the wrong property in the findCustodianByDisplayName method, and also we can filter out a custodian that we don't need from the list of custodians.

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• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

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[github-actions]

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[Ameralameri]

Approv

[metamaskbot]

Builds ready [0aa1001]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4
  • common: 0, 1, 2, 3, 4, 5, 6, 7
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1647 ± 60 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	125	192	151	19	9
		domContentLoaded	1452	1965	1647	126	60
		load	1453	1965	1647	126	60
		domInteractive	1452	1965	1647	126	60

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (97bb2c4) 68.36% compared to head (0aa1001) 68.36%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #21004   +/-   ##
========================================
  Coverage    68.36%   68.36%           
========================================
  Files         1006     1006           
  Lines        40262    40265    +3     
  Branches     10763    10765    +2     
========================================
+ Hits         27522    27525    +3     
  Misses       12740    12740           

Files Changed	Coverage Δ
...pers/utils/institutional/find-by-custodian-name.ts	100.00% <100.00%> (ø)
ui/pages/institutional/custody/custody.js	75.61% <100.00%> (+0.12%)	⬆️

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