tests: fix test 1167 to skip digit-only symbols

This avoids mistaking symbols with their numeric value when using
certain C preprocessors which output these numeric values at the
beg

tests: fix test 1167 to skip digit-only symbols

This avoids mistaking symbols with their numeric value when using
certain C preprocessors which output these numeric values at the
beginning of the line as part of an expression.

Seen on OpenBSD 7.5 + clang.

Example `test1167.pl -v` output, before this patch:
```
Source: cpp /home/runner/work/curl/curl/tests/../include/curl/curl.h
Symbol: 20000
Line #3835: 20000 + 142,
[...]
Bad symbols in public header files:
20000
[...]
```
Ref: https://github.com/curl/curl/actions/runs/9069136530/job/24918015357#step:3:7513

Ref: #13583
Closes #13634

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tests: rename tests scripts to the test number

It is hard to name the scripts sensibly. Lots of them are similarly
named and the name did not tell which test that used them.

The

tests: rename tests scripts to the test number

It is hard to name the scripts sensibly. Lots of them are similarly
named and the name did not tell which test that used them.

The new approach is rather to name them based on the test number that
runs them. Also helps us see which scripts are for individual tests
rather than for general test infra.

- badsymbols.pl -> test1167.pl
- check-deprecated.pl -> test1222.pl
- check-translatable-options.pl -> test1544.pl
- disable-scan.pl -> test1165.pl
- error-codes.pl -> test1175.pl
- errorcodes.pl -> test1477.pl
- extern-scan.pl -> test1135.pl
- manpage-scan.pl -> test1139.pl
- manpage-syntax.pl -> test1173.pl
- markdown-uppercase.pl -> test1275.pl
- mem-include-scan.pl -> test1132.pl
- nroff-scan.pl -> test1140.pl
- option-check.pl -> test1276.pl
- options-scan.pl -> test971.pl
- symbol-scan.pl -> test1119.pl
- version-scan.pl -> test1177.pl

Closes #12487

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