*: 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

[ti-chi-bot[bot]]

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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.

:exclamation: 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 :warning:

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/pingcap/tiup/pull/2475/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [cluster](https://app.codecov.io/gh/pingcap/tiup/pull/2475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `42.74% <0.00%> (-2.00%)` | :arrow_down: | | [playground](https://app.codecov.io/gh/pingcap/tiup/pull/2475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `16.13% <50.00%> (+0.02%)` | :arrow_up: | | [unittest](https://app.codecov.io/gh/pingcap/tiup/pull/2475/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

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