[inputs.win_perf_counters] warnings although IgnoredErrors is set

### Relevant telegraf.conf

```toml
[[inputs.win_perf_counters]]
IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"]

[[inputs.win_perf_counters.object]]
ObjectName = "Process"
Instances = ["w3wp","w3wp#1","w3wp#2","w3wp#3"]
Counters = [
"% Processor Time",
"Private Bytes",
"IO Read Bytes/sec",
"IO Write Bytes/sec",
"Page Faults/sec"
]
Measurement = "win_proc"
IncludeTotal = false
```

### Logs from Telegraf

```text
With IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"]

2025-03-21T10:14:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#1)\\% Processor Time", instance: w3wp#1, will skip metric: A counter with a negative value was detected.
2025-03-21T10:14:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#1)\\IO Read Bytes/sec", instance: w3wp#1, will skip metric: A counter with a negative value was detected.
2025-03-21T10:14:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#2)\\IO Read Bytes/sec", instance: w3wp#2, will skip metric: A counter with a negative value was detected.

Without IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"]

2025-03-21T10:54:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#1)\\% Processor Time", instance: w3wp#1, will skip metric: A counter with a negative value was detected.
2025-03-21T10:54:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#2)\\% Processor Time", instance: w3wp#2, will skip metric: A counter with a negative value was detected.
2025-03-21T10:54:30+01:00 W! [inputs.win_perf_counters] Error while getting value for counter "\\Process(w3wp#3)\\% Processor Time", instance: w3wp#3, will skip metric: A counter with a negative value was detected.

```

### System info

Telegraf 1.33.0, Windows Server 2012R2

### Docker

_No response_

### Steps to reproduce

1. Added IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"] to Telgraf config
2. Restart Telegraf Service
3. Removed IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"] from Telegraf config
4. Restart Telegraf Service.

### Expected behavior

I would expect that with ` IgnoredErrors = ["PDH_CALC_NEGATIVE_VALUE"]` set no log entry will appear, because I want to ignore such errors by the win_perf_counters plugin.

If it only means to output a warning instead of an error, that we might need to have another option like `IgnoreWarnings = ["PDH_CALC_NEGATIVE_VALUE"]` as well.

The code line `m.Log.Warnf("Error while getting value for counter %q, instance: %s, will skip metric: %v", metric.counterPath, metric.instance, err)` is in my opinion a bit misleading, because it is outputting a warning with a message starting with "Error ..."

### Actual behavior

I am trying to understand the behavior of Telegraf with or without the “IgnoredErrors” list set. I occasionally get log entries with the message “A counter with a negative value was detected.” I am trying to limit the log entries to only show real errors, becasue we are ingesting them with Grafana Alloy and Loki. I have therefore put some PDH errors in the IgnoredErrors list. Unfortunately, this makes no difference to the output.

If I understand the Go code in win_perf_counters.go line 536 correctly, then a message is only output if err is not nil and the function isKnownCounterDataError decides whether the message should be outputted as an error or as a warning.

The logs of both cases (with or without IgnoredErrors) shows the message severies as "W!" which means "warning".

### Additional info

I also tried it with `IgnoredErrors = ["PDH_NO_DATA", "PDH_INVALID_DATA", "PDH_CSTATUS_INVALID_DATA", "PDH_CALC_NEGATIVE_VALUE"]` which also makes no difference.

Start in the win_perf_counters.go code around line 536 and compare how IgnoredErrors is used with the warning path shown in the issue logs. Reproduce the plugin with and without PDH_CALC_NEGATIVE_VALUE in the configuration, then verify that the resulting log behavior matches the documented meaning of IgnoredErrors.

Written by the indexing model from the issue text.