Refactor BackendConfigurationFiles page object to use indexed ID selectors

[Copilot]

Aligns BackendConfigurationFiles page object with the pattern established in BackendConfigurationProperties (line 299), switching from DOM traversal to direct indexed ID selectors for element fetching.

HTML Template Changes:

• Added indexed ID templates: fileId-{{i}}, fileCreateDate-{{i}}, fileName-{{i}}, editTagsBtn-{{i}}
• Added let-i="index" to templates requiring row indexing

Page Object Refactoring:

• Replaced DOM traversal with direct ID selectors matching reference pattern:

  // Before: await this.row.$('.mat-column-id span')
  // After:  await (await $('#fileId-'+rowNum)).getText()

• Updated button selectors: $('#editTagsBtn-'+rowNum), $('#viewPdfBtn-'+rowNum), etc.
• Removed unused row and checkbox fields from FileRowObject
• Retained row-based querying for dynamic arrays (properties/tags)

Original prompt

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This section details on the original issue you should resolve

<issue_title>fix wdio page objects to fecth the dom elements the same way</issue_title>
<issue_description>Use https://github.com/microting/eform-backendconfiguration-plugin/blob/master/eform-client/e2e/Page%20objects/BackendConfiguration/BackendConfigurationProperties.page.ts#L299 as reference to implement the same style in these Page Obejcts:

eform-client/e2e/Page objects/BackendConfiguration/BackendConfigurationFiles.page.ts</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes fix wdio page objects to fecth the dom elements the same way #563

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