Remove inaccurate pre-check in shrink index page

[gaobinlong]

Description

There are some minor changes in the shrink index page:

1. Remove inaccurate pre-check, when a copy of every shard of the source index do not reside on the same node, then shrink api call will fail, currently we have checked the index settings before users click the shrink button to see whether the source index contains a index setting like index.routing.allocation.require._* or not, if not a warning will be shown in the page, but this pre-check is not accurate because if the cluster has only one node or the setting index.number_of_replicas of the source index is equal to the number of nodes minus 1 , then users do not need to allocate a copy of every shard to one node, so we'd better remove it.
2. Change some wording in the page, like change Green to green in the error message.

Issues Resolved

#558

Check List

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[codecov-commenter]

Codecov Report

Merging #570 (5164cba) into main (d3d8e6f) will increase coverage by 10.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #570       +/-   ##
===========================================
+ Coverage   49.67%   59.70%   +10.03%     
===========================================
  Files         195      268       +73     
  Lines        6225     8863     +2638     
  Branches     1023     1616      +593     
===========================================
+ Hits         3092     5292     +2200     
- Misses       2910     3177      +267     
- Partials      223      394      +171     

Impacted Files	Coverage Δ
...oards-plugin/public/pages/Indices/utils/helpers.ts	84.12% <0.00%> (-15.88%)	⬇️
...gement-dashboards-plugin/public/utils/constants.ts	95.23% <0.00%> (-4.77%)	⬇️
...ublic/pages/Indices/containers/Indices/Indices.tsx	82.50% <0.00%> (-3.62%)	⬇️
...ement-dashboards-plugin/public/pages/Main/Main.tsx	6.32% <0.00%> (-1.08%)	⬇️
...-dashboards-plugin/public/index_management_app.tsx	6.25% <0.00%> (-0.42%)	⬇️
...p/containers/CreateRollupForm/CreateRollupForm.tsx	69.86% <0.00%> (-0.36%)	⬇️
...ndex-management-dashboards-plugin/public/plugin.ts	0.00% <0.00%> (ø)
...ex-management-dashboards-plugin/utils/constants.ts	100.00% <0.00%> (ø)
...ic/components/ContentPanel/ContentPanelActions.tsx	100.00% <0.00%> (ø)
...atePolicy/components/FlyoutFooter/FlyoutFooter.tsx	66.66% <0.00%> (ø)
... and 86 more

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[Hailong-am]

LGTM