Use "brand" as column heading

[fulldecent]

Questions	Answers
Branch?	develop
Description?	This fixes the example import file products_example.csv to use the format expected during import process. It replaces "Manufacturer" by "Brand" in the CSV example file. Consequently in the import process, the data column and the file columns are matched. See the "How to test" to better understand.
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
How to test?	See below
UI Tests
Fixed issue or discussion?	Progress on #36117, related to https://github.com/PrestaShop/PrestaShop/discussions/ {discussion number here} but does not completely fix them
Related PRs	None

How to test?

In order to understand the problem

1. Go to backoffice import page, download the "Sample product file"
2. This is a CSV file named products_import.csv. Keep it.
3. Now you are in backoffice import page. Fill the form:

• * What do you want to import? input "Products"
• Select a file to import input the products_import.csv file you downloaded

4. Click on "Next step"
5. On the next screen, use the arrows to browse the file and see the column "Manufacturer" in the file. It is used to match the "Brand" column in the data matching

In order to verify the fix

1. Use the code from this PR. Go to backoffice import page, download the "Sample product file"
2. This is a CSV file named products_import.csv. Keep it.
3. Now you are in backoffice import page. Fill the form:

• * What do you want to import? input "Products"
• Select a file to import input the products_import.csv file you downloaded

4. Click on "Next step"
5. On the next screen, use the arrows to browse the file and see the column "Brand" in the file. It is used to match the "Brand" column in the data matching. The two match!

[prestonBot]

Hi, thanks for this contribution!

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[matks]

Accurate change is It replaces "Manufacturer" by "Brand" in the CSV example file -> added to PR description

[matks]

Hello @fulldecent I have improved the "How to test" section of your Pull Request to make it crystal clear what you are improving. PrestaShop is a big software, not everyone knows every feature it has, and the Import feature is not the more well known.

Could you please run the UI Tests with your PR? And paste in your PR description the link to the run. Read this page to know why and how to use this tool..