Remove templating from INFO/WARN/ERROR log messages

[rarkins]

Describe the proposed change(s).

It is common for Renovate admins to use metrics on INFO and above level messages. When such messages use string templating, it means you can't easily "group"/count them in backends. Instead, we should use log metadata for variable data instead, and keep fixed message strings.

Here is an example of some of the types of changes needed:

diff --git a/lib/modules/datasource/hex/index.ts b/lib/modules/datasource/hex/index.ts
index ebf03fbfb..f6246381e 100644
--- a/lib/modules/datasource/hex/index.ts
+++ b/lib/modules/datasource/hex/index.ts
@@ -55,7 +55,7 @@ export class HexDatasource extends Datasource {
     const { val: result, err } = await this.http
       .getJsonSafe(hexUrl, HexRelease)
       .onError((err) => {
-        logger.warn({ datasource: 'hex', packageName, err }, `Error fetching ${hexUrl}`); // prettier-ignore
+        logger.warn({ datasource: 'hex', url: hexUrl, packageName, err }, 'Error fetching datasource url'); // prettier-ignore
       })
       .unwrap();
 
diff --git a/lib/modules/manager/pip-compile/extract.ts b/lib/modules/manager/pip-compile/extract.ts
index 1ef63fc65..60c4a90ee 100644
--- a/lib/modules/manager/pip-compile/extract.ts
+++ b/lib/modules/manager/pip-compile/extract.ts
@@ -66,7 +66,10 @@ export async function extractAllPackageFiles(
       compileArgs = extractHeaderCommand(fileContent, fileMatch);
       compileDir = inferCommandExecDir(fileMatch, compileArgs.outputFile);
     } catch (error) {
-      logger.warn({ fileMatch }, `pip-compile: ${error.message}`);
+      logger.warn(
+        { fileMatch, errorMessage: error.message },
+        'pip-compile error',
+      );
       continue;
     }
     lockFileArgs.set(fileMatch, compileArgs);
diff --git a/lib/workers/repository/update/pr/index.ts b/lib/workers/repository/update/pr/index.ts
index edc851770..074eb4d15 100644
--- a/lib/workers/repository/update/pr/index.ts
+++ b/lib/workers/repository/update/pr/index.ts
@@ -573,7 +573,7 @@ export async function ensurePr(
       logger.debug('Passing error up');
       throw err;
     }
-    logger.error({ err }, 'Failed to ensure PR: ' + prTitle);
+    logger.error({ err, prTitle }, 'Failed to ensure PR');
   }
   if (existingPr) {
     return { type: 'with-pr', pr: existingPr };