Session extras in session listings are shown as numbers instead of strings

[vkarak]

When you pass a session extra that looks like a number, e.g. --session-extras x=12.30, ReFrame will show it as a number when listing the information of that session, although it has correctly stored it as a string.

Steps to reproduce

1. Enable results storage

export RFM_ENABLE_RESULTS_STORAGE=y

2. Run with --session-extras

reframe -c unittests/resources/checks/frontend_checks.py -n ^PerformanceFailureCheck -r --session-extras x=12.30,y=12.31

3. View session listing

./bin/reframe --list-stored-sessions=<uuid>

┍━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━┑
│ UUID                                 │ Start time           │ End time             │   Num runs │   Num cases │    x │     y │
┝━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━┿━━━━━━━━━━━━━┿━━━━━━┿━━━━━━━┥
│ 8d470a9a-505d-490f-a749-ae30aff0cd1f │ 20250226T152854+0100 │ 20250226T152856+0100 │          1 │           1 │ 12.3 │ 12.31 │
┕━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━┙

Note that x's value is listed as 12.3 instead of 12.30.

4. Queries with string comparison though work as expected:

reframe --list-stored-sessions='?x=="12.30"'

┍━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━┯━━━━━━━━━━━━━┯━━━━━━┯━━━━━━━┑
│ UUID                                 │ Start time           │ End time             │   Num runs │   Num cases │    x │     y │
┝━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━┿━━━━━━━━━━━━┿━━━━━━━━━━━━━┿━━━━━━┿━━━━━━━┥
│ 8d470a9a-505d-490f-a749-ae30aff0cd1f │ 20250226T152854+0100 │ 20250226T152856+0100 │          1 │           1 │ 12.3 │ 12.31 │
┕━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━┷━━━━━━━━━━━━━┷━━━━━━┷━━━━━━━┙

I think this is due to the default behaviour of tabulate that interprets table cells as numbers if they seem so.