Add nearing quota warning

[girishpanchal30]

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• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Show a warning for exceeding quota soon if the user reaches over 50% of their monthly visit limit within two weeks.

Closes https://github.com/Codeinwp/optimole-service/issues/1318

How to test the changes in this Pull Request:

1. Merge PR #1442 to use the days_since_registration value.
2. Manually update the visitor's limit.
3. Go to the plugin dashboard to see the warning.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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[abaicus]

@girishpanchal30 looks good 👍🏻

Can you please also fix the merge conflict on this? Thank you!

[girishpanchal30]

@abaicus Resolved

[girishpanchal30]

@abaicus I applied the following changes to test_preloading_header_image and test_preloading_logo, which seem to have resolved the PHPUnit test case errors.

index 4ad23a7..3375b31 100644
--- a/tests/test-preloading.php
+++ b/tests/test-preloading.php
@@ -52,7 +52,12 @@ class Test_Preloading extends WP_UnitTestCase {
 		set_theme_mod( 'header_image', $header_image_data->url );
 		set_theme_mod( 'header_image_data', $header_image_data );
 
-		$header = get_header_image_tag();
+		$header = get_header_image_tag(
+			array(
+				'fetchpriority' => 'high',
+			)
+		);
+
 		$this->assertStringContainsString( 'fetchpriority="high"', $header );
 
 		// Test it doesn't add the attribute when called again.
@@ -62,11 +67,18 @@ class Test_Preloading extends WP_UnitTestCase {
 
 	public function test_preloading_logo() {
 		set_theme_mod( 'custom_logo', self::$sample_attachement );
+		add_filter( 'get_custom_logo_image_attributes', array( $this, 'custom_logo_image_attributes' ), 999 );
 		$logo = get_custom_logo();
+		remove_filter( 'get_custom_logo_image_attributes', array( $this, 'custom_logo_image_attributes' ), 999 );
 		$this->assertStringContainsString( 'fetchpriority="high"', $logo );
 
 		// Test it doesn't add the attribute when called again.
 		$logo = get_custom_logo();
 		$this->assertStringNotContainsString( 'fetchpriority="high"', $logo );
 	}
+
+	public function custom_logo_image_attributes( $attributes ) {
+		$attributes['fetchpriority'] = 'high';
+		return $attributes;
+	}
 }

Should I include these changes in this PR?

[selul]

@girishpanchal30 please rebase to have the tests fixed

[girishpanchal30]

@selul Done!