Description of the issue this commit addresses:

A new tax has been added and will be used as from the first of september 2024. With this new tax, the tax report has been modified to include it by adding a new line but what's actually required as from the first september is to include the new tax to the existing 24% tax line in the report.

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Desired behavior after this commit is merged:

The 25.5% tax line in the report includes both 24.0 and 25.5 rates and is named after the 25.5 one but still says that the 24.0 rate taxes are included in it. This will be changed to totally exclude the 24.0 rate once it will not be used anymore probably on the first of january 2025.

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Documentation:
Change of default VAT rate: https://www.vero.fi/en/businesses-and-corporations/taxes-and-charges/vat/rates-of-vat/new-vat-rate-from-1-september-2024--instructions-for-vat-reporting/
Line about both taxes being in the same line of the report: https://www.vero.fi/en/businesses-and-corporations/taxes-and-charges/vat/rates-of-vat/new-vat-rate-from-1-september-2024--instructions-for-vat-reporting/#:~:text=All%20sales%20with%20both%20the%2024%25%20and%20the%2025.5%25%20rates%20must%20be%20entered%20into%20the%20same%20space%20on%20the%20form

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task-4101930

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I confirm I have signed the CLA and read the PR guidelines at www.odoo.com/submit-pr

Forward-Port-Of: odoo/odoo#178453
Forward-Port-Of: odoo/odoo#175963

Since [1], applying a font-size on some snippet default text was not working properly anymore. As soon as the actual text was changed, the features were working again.

Steps to reproduce:
- Enter website edit mode.
- Add a "Title" snippet.
- Triple-click on the default text.
- Hit the font-size "Default" button.
 => Nothing happens, you cannot restore the default title size.

Other steps to reproduce:
- Enter website edit mode.
- Add a "Title" snippet.
- Triple-click on the default text.
- Choose a font-size (like "8").
 => It is applied but inside the pre-existing 62px environment instead of replacing it, meaning the DOM looks like this:
   ```xml
    <font style="font-size: 62px;">
        <font style="font-size: 8px;">Title</font>
    </font>
    ```
    While it seems insignificant, this creates vertical misalignment.
    Depending on the use case, it might be problematic (e.g. a long
    paragraph instead of a title: it would have a big line spacing for
    no apparent reason). Note that this one is actually a more generic
    problem already but [1] worsened it. We might fully solve that issue
    in future versions.

To fix the issue, we now ensure that applying any editor command on some
default text makes it not-default text anymore.

opw-3957198

Forward-Port-Of: odoo/odoo#178286
Forward-Port-Of: odoo/odoo#178083