*: polish the trust key notice

[breezewish]

What problem does this PR solve?

Currently when installing TiUP, a misleading warning will be displayed:

What is changed and how it works?

Only display the warning, when JSON is accessed via insecure Internet.

And also carefully polished the words, to avoid being mis-interpreted as System root certificate.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release notes:

NONE

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 48.50%. Comparing base (505444d) to head (faf277c).
Report is 2 commits behind head on master.

❗ Current head faf277c differs from pull request most recent head 3856938

Please upload reports for the commit 3856938 to get more accurate results.

Files with missing lines	Patch %	Lines
pkg/localdata/profile.go	0.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (505444d) and HEAD (faf277c). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (505444d)	HEAD (faf277c)
unittest	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2475      +/-   ##
==========================================
- Coverage   54.86%   48.50%   -6.35%     
==========================================
  Files         336      335       -1     
  Lines       36372    36360      -12     
==========================================
- Hits        19953    17636    -2317     
- Misses      14014    16397    +2383     
+ Partials     2405     2327      -78     

Flag	Coverage Δ
cluster	42.74% <0.00%> (-2.00%)	⬇️
playground	16.13% <50.00%> (+0.02%)	⬆️
unittest	?

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[kaaaaaaang]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-13 10:13:36.221995929 +0000 UTC m=+437578.412864919: ☑️ agreed by kaaaaaaang.

[xhebox]

Install test will be fixed after merging