test: reduce the usage of defaultConfig

[RahulGautamSingh]

Describe the proposed change(s).

• In some tests we use defaultConfig = getConfig() which uses all the options, I think this is not a good idea because it creates incompatible type issues for the config objects as the type generated will be AllConfig
  Examples:
  

  renovate/lib/modules/manager/npm/extract/index.spec.ts

  Line 11 in 8621d8c

  // TODO: fix types

  
  

  renovate/lib/workers/repository/updates/generate.spec.ts

  Line 273 in 8621d8c

  // TODO #7154 incompatible types

• It also makes it hard to debug tests if the config isn't minimal

So I propose to replace defaultConfig = getConfig -> smaller configs which are narrowed down to contain only the options needed for the specific test

Example of what I mean:

    it('uses semantic commits', () => {
      // TODO #7154 incompatible types
      const branch: BranchUpgradeConfig[] = [
        {
          ...defaultConfig,
          manager: 'some-manager',
          depName: 'some-dep',
          semanticCommits: 'enabled',
          semanticCommitType: 'chore',
          semanticCommitScope: 'package',
          newValue: '1.2.0',
          isSingleVersion: true,
          newVersion: '1.2.0',
          foo: 1,
          group: {
            foo: 2,
          },
        } as BranchUpgradeConfig,
      ];
      const res = generateBranchConfig(branch);
      expect(res.prTitle).toBe(
        'chore(package): update dependency some-dep to v1.2.0'
      );
      expect(res.commitMessage).toBe(
        'chore(package): update dependency some-dep to v1.2.0'
      );
    });

The prev config only needs the default commit message options ie. commitMessage(Action|Prefix|Topic)

Will be using this issue till all non-necessary usage of defaultConfig have been replaced. 👍