Add "s" suffix to timeout entries

[Thanhphan1147]

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

Test results for commit abd3006

Test coverage for abd3006

Name                                     Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------------
lib/charms/haproxy/v1/haproxy_route.py     340     55     78     24    79%   167, 170, 218, 227-230, 255-258, 279-284, 565-566, 709-712, 716, 742-753, 778-780, 799-801, 810, 962-968, 972, 1145->1147, 1149->1151, 1151->1153, 1153->1155, 1155->1157, 1157->1160, 1192, 1197, 1202, 1227, 1255, 1259, 1263, 1286, 1307, 1317-1318, 1320->exit, 1356-1358, 1378, 1392, 1397-1399
src/charm.py                               221     79     64      7    56%   82, 178, 186-199, 204, 209, 225, 236, 242-243, 271-291, 310-326, 386-399, 412-417, 426, 438-452, 457, 467, 473-479, 489-495
src/haproxy.py                              94     37      2      0    59%   95, 104-110, 128-142, 155-164, 172-179, 188-197, 206-212, 220-229, 257, 281-283
src/http_interface.py                       73     25      4      0    62%   74, 83, 92, 106-108, 126, 138, 150, 162, 170-175, 187, 194, 202, 217-227
src/state/charm_state.py                    72     15     14      4    78%   89-91, 96-97, 100, 137-142, 151, 193-195, 207-208
src/state/exception.py                       1      0      0      0   100%
src/state/ha.py                             30      1      2      1    94%   50
src/state/haproxy_route.py                 105     19     28      5    76%   100, 114-117, 131-135, 149-157, 211, 221-222, 253, 261
src/state/ingress.py                        35      0      4      0   100%
src/state/ingress_per_unit.py               31      0      4      0   100%
src/state/tls.py                            38      5     10      3    83%   76, 114-119, 125-126
src/state/validation.py                     46     23      8      1    44%   66-67, 71-98
src/tls_relation.py                         43      5     12      4    84%   73-74, 76->75, 99-105, 117->119
------------------------------------------------------------------------------------
TOTAL                                     1129    264    230     49    72%

Static code analysis report

Run started:2025-07-29 10:20:01.402480

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4153
  Total lines skipped (#nosec): 4
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 3

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):