twister: fixes to statistics and counting, reduce platform scan verbosity

[nashif]

• twister: count filtered testcases as such, not as skipped
• twister: use consistent language for test configurations
• twister: do not report filtered cases in summary
• twister: stats: not run tests are also part not executed summary
• twister: remove verbose debug message about adding platforms

Fixes #81128

[golowanow]

Please remove 'Trivial' label - it is not so anymore for most of 9 commits here.

[golowanow]

just moving 'skipped' under 'selected' disbalancing the totals (skipped are not added to selected), eg.

Total test cases: 276
├─ Filtered test cases: 136
└─ Selected test cases: 130
   ├─ Passed test cases:       124
   ├─ Skipped test cases:       10
   ├─ Built only test cases:     0
   ├─ Blocked test cases:        0
   ├─ Failed test cases:         0
   ├─ Errors in test cases:      0
   ├──── The following test case statuses should not appear in a proper execution ───
   └─ Statusless test cases:     6

total 276 != 266, and selected 130 != 140

[LukaszMrugala]

Looks like it's working, so I only have some aesthetical fixes.

Before and after the summary changes:

--------------------------------------------------
Total test suites:     27
Processed test suites: 27
└─Filtered test suites: 11
  ├─ Filtered test suites (static):       10
  └─ Filtered test suites (at runtime):    1
└─ Selected test suites:                16
   ├─ Skipped test suites:                  0
   ├─ Passed test suites:                  13
   ├─ Built only test suites:               1
   ├─ Failed test suites:                   1
   └─ Errors in test suites:                1
----------------------      ----------------------
Total test cases: 176
├─ Filtered test cases:  29
└─ Selected test cases: 147
   ├─ Passed test cases:       119
   ├─ Skipped test cases:        1
   ├─ Built only test cases:    16
   ├─ Blocked test cases:        4
   ├─ Failed test cases:         2
   ├─ Errors in test cases:      0
   ├──── The following test case statuses should not appear in a proper execution ───
   └─ Statusless test cases:     5
--------------------------------------------------

--------------------------------------------------
Total test suites:     27
Processed test suites: 27
├─ Filtered test suites:    11
│  ├─ Filtered test suites (static):       10
│  └─ Filtered test suites (at runtime):    1
└─ Selected test suites:    16
   ├─ Skipped test suites:                  0
   ├─ Passed test suites:                  13
   ├─ Built only test suites:               1
   ├─ Failed test suites:                   1
   └─ Errors in test suites:                1
----------------------      ----------------------
Total test cases: 176
├─ Filtered test cases:  29
└─ Selected test cases: 147
   ├─ Passed test cases:       119
   ├─ Skipped test cases:        1
   ├─ Built only test cases:    16
   ├─ Blocked test cases:        4
   ├─ Failed test cases:         2
   ├─ Errors in test cases:      0
   ├──── The following test case statuses should not appear in a proper execution ───
   └─ Statusless test cases:     5
--------------------------------------------------

[nashif]

Looks like it's working, so I only have some aesthetical fixes.

this manual creation of the tree is such a pain, especially when some of the tests are trying to parse it. Need to create this using python instead.

feedback addressed