fix(batect): "Failed to parse newContent"

[charleskorn]

Changes:

This fixes an issue where all updates with the batect manager would fail.
It also adds logging for errors like this so that they're easier to diagnose in the future.

Context:

Updates to Batect configuration files (either Docker image references or bundle versions) were broken. Logs would contain messages like this:

DEBUG: prAlreadyExisted=false(branch="renovate/docker-golang-1.x")
DEBUG: Checking schedule(at any time, null)(branch="renovate/docker-golang-1.x")
DEBUG: No schedule defined(branch="renovate/docker-golang-1.x")
DEBUG: Branch needs creating(branch="renovate/docker-golang-1.x")
DEBUG: Using reuseExistingBranch: false(branch="renovate/docker-golang-1.x")
DEBUG: manager.getUpdatedPackageFiles()(branch="renovate/docker-golang-1.x")
{
  "reuseExistingBranch": false,
  "branchName": "renovate/docker-golang-1.x"
}
DEBUG: Starting search at index 43(packageFile="batect-bundle.yml", branch="renovate/docker-golang-1.x")
{
  "depName": "golang"
}
DEBUG: Found match at index 43(packageFile="batect-bundle.yml", branch="renovate/docker-golang-1.x")
{
  "depName": "golang"
}
DEBUG: Failed to parse newContent(packageFile="batect-bundle.yml", branch="renovate/docker-golang-1.x")
{
  "manager": "batect"
}
DEBUG: No newUpgrade(packageFile="batect-bundle.yml", branch="renovate/docker-golang-1.x")
{
  "manager": "batect"
}
WARN: Error updating branch: update failure(branch="renovate/docker-golang-1.x")

The error parsing newContent is due to auto-replace.ts expecting the manager to implement extractPackageFile, but the Batect manager doesn't implement this, and instead provided only extractAllPackageFiles (see #8091 for more details).

I haven't added a unit test for this, but if there's an existing pattern for tests that would catch this kind of problem, please let me know and I can add one.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• No new tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 24.45.1 🎉

The release is available on:

• GitHub release
• 24.45.1

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