Use outline button variation in modals

[enisn]

Description

Part of https://github.com/volosoft/volo/issues/16449

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

How to test it?

Please describe how this can be tested by the test engineers if it is not already explicit - or remove this section if no need to description.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4fac3a8) 51.65% compared to head (4384eb6) 51.65%.
Report is 16 commits behind head on dev.

❗ Current head 4384eb6 differs from pull request most recent head 46afb5e. Consider uploading reports for the commit 46afb5e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #18842   +/-   ##
=======================================
  Coverage   51.65%   51.65%           
=======================================
  Files        3084     3084           
  Lines       97841    97841           
  Branches     7808     7808           
=======================================
  Hits        50537    50537           
  Misses      45751    45751           
  Partials     1553     1553           

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[realLiangshiwei]

<Button style="margin: 0.25rem" Outline Color="Color.Primary" Clicked="OpenSendTestEmailModalAsync">@L["SendTestEmail"]</Button>

abp/modules/setting-management/src/Volo.Abp.SettingManagement.Blazor/Pages/SettingManagement/EmailSettingGroup/EmailSettingGroupViewComponent.razor

Line 98 in 4384eb6

<Button style="margin: 0.25rem" Color="Color.Primary" Clicked="OpenSendTestEmailModalAsync">@L["SendTestEmail"]</Button>