message: test-utils: avoid usage of private field syntax
diff: @@ -37,75 +37,75 @@ import { ConfigApi } from '@backstage/core-plugin-api';
  * ```
  */
  export class MockConfigApi implements ConfigApi {
  - readonly #config: ConfigReader;
  + private readonly config: ConfigReader;
  // NOTE: not extending in order to avoid inheriting the static `.fromConfigs`
  constructor(data: JsonObject) {
  - this.#config = new ConfigReader(data);
  + this.config = new ConfigReader(data);
  }
  /** {@inheritdoc @backstage/config#Config.has} */
  has(key: string): boolean {
  - return this.#config.has(key);
  + return this.config.has(key);
  }
  /** {@inheritdoc @backstage/config#Config.keys} */
  keys(): string[] {
  - return this.#config.keys();
  + return this.config.keys();
  }
  /** {@inheritdoc @backstage/config#Config.get} */
  get<T = JsonValue>(key?: string): T {
  - return this.#config.get(key);
  + return this.config.get(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptional} */
  getOptional<T = JsonValue>(key?: string): T | undefined {
  - return this.#config.getOptional(key);
  + return this.config.getOptional(key);
  }
  /** {@inheritdoc @backstage/config#Config.getConfig} */
  getConfig(key: string): Config {
  - return this.#config.getConfig(key);
  + return this.config.getConfig(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalConfig} */
  getOptionalConfig(key: string): Config | undefined {
  - return this.#config.getOptionalConfig(key);
  + return this.config.getOptionalConfig(key);
  }
  /** {@inheritdoc @backstage/config#Config.getConfigArray} */
  getConfigArray(key: string): Config[] {
  - return this.#config.getConfigArray(key);
  + return this.config.getConfigArray(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalConfigArray} */
  getOptionalConfigArray(key: string): Config[] | undefined {
  - return this.#config.getOptionalConfigArray(key);
  + return this.config.getOptionalConfigArray(key);
  }
  /** {@inheritdoc @backstage/config#Config.getNumber} */
  getNumber(key: string): number {
  - return this.#config.getNumber(key);
  + return this.config.getNumber(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalNumber} */
  getOptionalNumber(key: string): number | undefined {
  - return this.#config.getOptionalNumber(key);
  + return this.config.getOptionalNumber(key);
  }
  /** {@inheritdoc @backstage/config#Config.getBoolean} */
  getBoolean(key: string): boolean {
  - return this.#config.getBoolean(key);
  + return this.config.getBoolean(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalBoolean} */
  getOptionalBoolean(key: string): boolean | undefined {
  - return this.#config.getOptionalBoolean(key);
  + return this.config.getOptionalBoolean(key);
  }
  /** {@inheritdoc @backstage/config#Config.getString} */
  getString(key: string): string {
  - return this.#config.getString(key);
  + return this.config.getString(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalString} */
  getOptionalString(key: string): string | undefined {
  - return this.#config.getOptionalString(key);
  + return this.config.getOptionalString(key);
  }
  /** {@inheritdoc @backstage/config#Config.getStringArray} */
  getStringArray(key: string): string[] {
  - return this.#config.getStringArray(key);
  + return this.config.getStringArray(key);
  }
  /** {@inheritdoc @backstage/config#Config.getOptionalStringArray} */
  getOptionalStringArray(key: string): string[] | undefined {
  - return this.#config.getOptionalStringArray(key);
  + return this.config.getOptionalStringArray(key);
  }
  }
  